RUM-8141: Add OpenTracing API as exported dependency to OkHttp instrumentation

[0xnm]

What does this PR do?

Fixes #2486, check for more details there.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.97%. Comparing base (58f27a4) to head (80099c4).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2488      +/-   ##
===========================================
+ Coverage    69.88%   69.97%   +0.09%     
===========================================
  Files          788      788              
  Lines        29647    29647              
  Branches      4961     4961              
===========================================
+ Hits         20717    20744      +27     
+ Misses        7548     7526      -22     
+ Partials      1382     1377       -5     

see 33 files with indirect coverage changes