[OpenTelemetry] Add an experiment to enable the instrumentation agent in Java's portability harness

[sjvanrossum]

To support OpenTelemetry this change adds the Java instrumentation agent to the portability harness, guarded by an experiment. Acquiring a handle to an OpenTelemetry instance is enabled by a new SdkHarnessOptions property.

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Codecov Report

:x: Patch coverage is 0% with 23 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 56.77%. Comparing base (d0e48e2) to head (e122f21). :warning: Report is 500 commits behind head on master.

Files with missing lines	Patch %	Lines
sdks/java/container/boot.go	0.00%	23 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #35227    +/-   ##
==========================================
  Coverage     56.76%   56.77%            
  Complexity     3384     3384            
==========================================
  Files          1220     1220            
  Lines        185448   185563   +115     
  Branches       3520     3520            
==========================================
+ Hits         105277   105351    +74     
- Misses        76843    76877    +34     
- Partials       3328     3335     +7     

Flag	Coverage Δ
go	28.22% <0.00%> (+0.05%)	:arrow_up:

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This pull request has been marked as stale due to 60 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the [email protected] list. Thank you for your contributions.