Fix issue #5795

[simonlei]

Fix the issue: nutz plugin throw NPE at afterMethod, cause traceid keep unchange for the thread

Fix

• Add a unit test to verify that the fix works.

• Explain briefly about why the bug exists and how to fix it.

• Closes nutz plugin throw NPE at afterMethod, cause traceid keep unchange for the thread #5795.

• Update the CHANGES log.

[kezhenxu94]

Thanks for contributing, please fix codestyle(you can run ./mvnw checkstyle:check locally to verify), and update the CHANGES.md

[simonlei]

Thanks for contributing, please fix codestyle(you can run ./mvnw checkstyle:check locally to verify), and update the CHANGES.md

Thanks for the reply. Fixed codestyle and update the CHANGES.md.

[codecov]

Codecov Report

Merging #5797 into master will decrease coverage by 52.74%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #5797       +/-   ##
============================================
- Coverage     52.74%   0.00%   -52.75%     
============================================
  Files           892     166      -726     
  Lines         22406    3991    -18415     
  Branches       2141     458     -1683     
============================================
- Hits          11819       0    -11819     
+ Misses         9637    3991     -5646     
+ Partials        950       0      -950     

Impacted Files	Coverage Δ	Complexity Δ
...ywalking/apm/agent/core/logging/core/LogLevel.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...ywalking/apm/agent/core/plugin/EnhanceContext.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...ywalking/apm/agent/core/profile/ProfileStatus.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...walking/apm/agent/core/context/SW8CarrierItem.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...walking/apm/agent/core/jvm/cpu/SunCpuAccessor.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...walking/apm/agent/core/logging/core/LogOutput.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...walking/apm/agent/core/plugin/match/NameMatch.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...alking/apm/agent/core/context/CarrierItemHead.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...alking/apm/agent/core/jvm/gc/ParallelGCModule.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...lking/apm/agent/core/remote/GRPCChannelStatus.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
... and 876 more

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