use jackson to snake case for better performance

[rudygt]

Description of changes:

Hello, I am big fan of making things faster and originally was trying to avoid some String.replaceAll calls in TracingHandler, but found that you already have a better StringTransform implementation but not using it there,

after looking more deeply I found that using the SnakeCaseStrategy from PropertyNamingStrategies that is already highly optimized was the best route.

Thanks.

ps. I checked the performance using this branch https://github.com/rudygt/aws-xray-sdk-java/tree/benchmark, I dont think merging that test is needed. this is the output I get on my system.

Benchmark                                                           Mode      Cnt     Score      Error   Units
SnakeCaseBenchmark.jacksonSnakeCase                                thrpt        5    27.105 �    0.527  ops/us
SnakeCaseBenchmark.jacksonSnakeCase:�gc.alloc.rate                 thrpt        5  7155.905 �   96.815  MB/sec
SnakeCaseBenchmark.jacksonSnakeCase:�gc.alloc.rate.norm            thrpt        5   416.000 �    0.001    B/op
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Eden_Space        thrpt        5  7087.917 � 1873.788  MB/sec
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Eden_Space.norm   thrpt        5   411.981 �  104.107    B/op
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Old_Gen           thrpt        5     0.003 �    0.004  MB/sec
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Old_Gen.norm      thrpt        5    ? 10??               B/op
SnakeCaseBenchmark.jacksonSnakeCase:�gc.count                      thrpt        5    38.000             counts
SnakeCaseBenchmark.jacksonSnakeCase:�gc.time                       thrpt        5    30.000                 ms
SnakeCaseBenchmark.ownSnakeCase                                    thrpt        5     4.139 �    0.131  ops/us
SnakeCaseBenchmark.ownSnakeCase:�gc.alloc.rate                     thrpt        5  5303.713 �  174.552  MB/sec
SnakeCaseBenchmark.ownSnakeCase:�gc.alloc.rate.norm                thrpt        5  2024.002 �    0.001    B/op
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Eden_Space            thrpt        5  5294.799 � 1334.128  MB/sec
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Eden_Space.norm       thrpt        5  2019.998 �  456.831    B/op
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Old_Gen               thrpt        5     0.003 �    0.006  MB/sec
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Old_Gen.norm          thrpt        5     0.001 �    0.002    B/op
SnakeCaseBenchmark.ownSnakeCase:�gc.count                          thrpt        5    42.000             counts
SnakeCaseBenchmark.ownSnakeCase:�gc.time                           thrpt        5    29.000                 ms
SnakeCaseBenchmark.jacksonSnakeCase                               sample  2103354     0.650 �    0.012   us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p0.00        sample              0.400              us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p0.50        sample              0.500              us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p0.90        sample              0.900              us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p0.95        sample              0.900              us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p0.99        sample              0.900              us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p0.999       sample              3.700              us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p0.9999      sample             34.048              us/op
SnakeCaseBenchmark.jacksonSnakeCase:jacksonSnakeCase�p1.00        sample           1634.304              us/op
SnakeCaseBenchmark.jacksonSnakeCase:�gc.alloc.rate                sample        5  7028.249 �  184.340  MB/sec
SnakeCaseBenchmark.jacksonSnakeCase:�gc.alloc.rate.norm           sample        5   416.135 �    0.013    B/op
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Eden_Space       sample        5  7031.250 � 1664.497  MB/sec
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Eden_Space.norm  sample        5   416.249 �   92.975    B/op
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Old_Gen          sample        5     0.002 �    0.009  MB/sec
SnakeCaseBenchmark.jacksonSnakeCase:�gc.churn.G1_Old_Gen.norm     sample        5    ? 10??               B/op
SnakeCaseBenchmark.jacksonSnakeCase:�gc.count                     sample        5    43.000             counts
SnakeCaseBenchmark.jacksonSnakeCase:�gc.time                      sample        5    34.000                 ms
SnakeCaseBenchmark.ownSnakeCase                                   sample  2674887     3.737 �    0.024   us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p0.00                sample              2.500              us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p0.50                sample              2.900              us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p0.90                sample              4.696              us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p0.95                sample              4.800              us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p0.99                sample              5.000              us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p0.999               sample             16.576              us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p0.9999              sample            100.668              us/op
SnakeCaseBenchmark.ownSnakeCase:ownSnakeCase�p1.00                sample           1898.496              us/op
SnakeCaseBenchmark.ownSnakeCase:�gc.alloc.rate                    sample        5  5664.450 �  574.098  MB/sec
SnakeCaseBenchmark.ownSnakeCase:�gc.alloc.rate.norm               sample        5  2024.767 �    0.167    B/op
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Eden_Space           sample        5  5763.147 � 1199.824  MB/sec
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Eden_Space.norm      sample        5  2060.170 �  379.310    B/op
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Old_Gen              sample        5     0.007 �    0.022  MB/sec
SnakeCaseBenchmark.ownSnakeCase:�gc.churn.G1_Old_Gen.norm         sample        5     0.003 �    0.008    B/op
SnakeCaseBenchmark.ownSnakeCase:�gc.count                         sample        5    41.000             counts
SnakeCaseBenchmark.ownSnakeCase:�gc.time                          sample        5    36.000                 ms

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.70588% with 6 lines in your changes missing coverage. Please review.

Project coverage is 28.09%. Comparing base (4103ea0) to head (bdb6640).
Report is 25 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/com/amazonaws/xray/handlers/TracingHandler.java	50.00%	4 Missing ⚠️
...mazonaws/xray/interceptors/TracingInterceptor.java	75.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #382      +/-   ##
============================================
+ Coverage     28.07%   28.09%   +0.01%     
+ Complexity      575      574       -1     
============================================
  Files           138      138              
  Lines          5253     5254       +1     
  Branches        634      634              
============================================
+ Hits           1475     1476       +1     
  Misses         3577     3577              
  Partials        201      201              

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