feat: Support java.util.concurrent.Executor （#515)

[xyohn]

Motivation:

SofaTracer does not support delegating java.util.concurrent.Executor

Modification:

add com.alipay.common.tracer.core.async.SofaTraceExecutor to support delegating java.util.concurrent.Executor

Result:

Fixes #515.

If there is no issue then describe the changes introduced by this PR.

[sofastack-cla]

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[nobodyiam]

@xzchaoo @glmapper Would you please help to take a look?

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.85%. Comparing base (76e0574) to head (c5dd1a4).
⚠️ Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
...ay/common/tracer/core/async/SofaTraceExecutor.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #516      +/-   ##
============================================
- Coverage     56.96%   56.85%   -0.12%     
  Complexity      213      213              
============================================
  Files           226      227       +1     
  Lines          6732     6737       +5     
  Branches        687      687              
============================================
- Hits           3835     3830       -5     
- Misses         2482     2491       +9     
- Partials        415      416       +1     

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