Modify the way we set custom header in triple protocol

[OrezzerO]

Motivation:

Modify the way we set custom header in triple protocol

[codecov]

Codecov Report

Merging #1138 (f26ebc2) into master (303ae5e) will increase coverage by 0.00%.
The diff coverage is 91.66%.

@@            Coverage Diff            @@
##             master    #1138   +/-   ##
=========================================
  Coverage     71.07%   71.08%           
  Complexity      833      833           
=========================================
  Files           405      405           
  Lines         17100    17098    -2     
  Branches       2669     2669           
=========================================
  Hits          12154    12154           
- Misses         3561     3563    +2     
+ Partials       1385     1381    -4     

Impacted Files	Coverage Δ
...ava/com/alipay/sofa/rpc/common/MetadataHolder.java	0.00% <ø> (-90.00%)	⬇️
...ofa/rpc/tracer/sofatracer/TripleTracerAdapter.java	59.54% <80.00%> (+5.27%)	⬆️
...ay/sofa/rpc/filter/ConsumerCustomHeaderFilter.java	100.00% <100.00%> (ø)
...y/sofa/rpc/filter/PressureMarkTransformFilter.java	100.00% <100.00%> (ø)
.../main/java/com/alipay/sofa/rpc/event/EventBus.java	80.39% <0.00%> (-3.93%)	⬇️
...com/alipay/sofa/rpc/context/RpcRuntimeContext.java	88.88% <0.00%> (+1.23%)	⬆️
...lipay/sofa/rpc/proxy/javassist/JavassistProxy.java	80.00% <0.00%> (+1.33%)	⬆️
...ansport/bolt/ReuseBoltClientConnectionManager.java	68.11% <0.00%> (+2.89%)	⬆️
... and 2 more

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[EvenLjj]

LGTM

[chuailiwu]

LGTM