Implement ResultSet.getObject(int/String, Class)

[marschall]

The optional ResultSet#getObject(int, Class) and
ResultSet#getObject(String, Class) methods are currently not
implemented.

Besides the conversions mentioned in appendix Appendix B, Table B-3 we
also support uniqueidentifier <-> UUID.

This commit does not include support for JSR-310 data types in order to
keep it smaller.

Fixes #6

[codecov-io]

Codecov Report

Merging #304 into dev will increase coverage by 1.19%.
The diff coverage is 80.86%.

@@             Coverage Diff              @@
##                dev     #304      +/-   ##
============================================
+ Coverage     42.69%   43.89%   +1.19%     
- Complexity     2290     2336      +46     
============================================
  Files           107      107              
  Lines         30220    30930     +710     
  Branches       5858     6087     +229     
============================================
+ Hits          12903    13576     +673     
+ Misses        15148    15031     -117     
- Partials       2169     2323     +154

Flag	Coverage Δ	Complexity Δ
#JDBC41	43.77% <80.86%> (+1.25%)	2329 <50> (+46)	⬆️
#JDBC42	43.83% <80.86%> (+1.27%)	2332 <50> (+53)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...om/microsoft/sqlserver/jdbc/SQLServerResource.java	100% <ø> (ø)	4 <0> (ø)	⬇️
...oft/sqlserver/jdbc/SQLServerCallableStatement.java	21.65% <64.17%> (+9.11%)	71 <16> (+32)	⬆️
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	50.14% <89.65%> (+1.46%)	78 <6> (+4)	⬆️
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	31.15% <93.93%> (+3.16%)	234 <28> (+33)	⬆️
src/main/java/com/microsoft/sqlserver/jdbc/AE.java	45.57% <0%> (-4.09%)	0% <0%> (ø)
src/main/java/microsoft/sql/DateTimeOffset.java	37.14% <0%> (-2.86%)	8% <0%> (-2%)
...ava/com/microsoft/sqlserver/jdbc/ScrollWindow.java	73.17% <0%> (-2.44%)	17% <0%> (-2%)
...oft/sqlserver/jdbc/SQLServerResultSetMetaData.java	40.14% <0%> (-0.71%)	22% <0%> (-1%)
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	51.88% <0%> (-0.43%)	379% <0%> (-41%)
... and 16 more

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[msftclas]

@marschall, thanks for signing the contribution license agreement. We will now validate the agreement and then the pull request.

Thanks, Microsoft Pull Request Bot

[marschall]

At least H2 and PostgreSQL have a G|UUID type as well and support reading UUIDs with getObject(int|String, UUID.class) as well.