feat: Add OpenTelemetry Support

[Abhi347]

feat: Add OpenTelemetry Support
feat: Add Support for Tracing Propagation Headers

Things to consider:

• The current PR might introduce a breaking change since the OpenCensus java files have new package. To mitigate this, I have kept the original classes at their place and extended them from the new classes. Additionally, marked them as deprecated too. This should resolve any breaking change for existing users of the tracing.

[codecov]

Codecov Report

Attention: Patch coverage is 74.82993% with 111 lines in your changes missing coverage. Please review.

Project coverage is 76.89%. Comparing base (8ddc6d0) to head (331caad).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/com/spotify/github/v3/clients/GitHubClient.java	75.08%	63 Missing and 7 partials ⚠️
...fy/github/tracing/opencensus/OpenCensusTracer.java	43.24%	21 Missing ⚠️
...java/com/spotify/github/v3/clients/NoopTracer.java	65.00%	7 Missing ⚠️
...n/java/com/spotify/github/tracing/TraceHelper.java	78.57%	3 Missing ⚠️
...hub/tracing/opentelemetry/OpenTelemetryTracer.java	91.17%	2 Missing and 1 partial ⚠️
...in/java/com/spotify/github/tracing/BaseTracer.java	83.33%	2 Missing ⚠️
...tify/github/tracing/opencensus/OpenCensusSpan.java	90.00%	2 Missing ⚠️
...ithub/tracing/opentelemetry/OpenTelemetrySpan.java	90.00%	2 Missing ⚠️
...om/spotify/github/opencensus/OpenCensusTracer.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #198      +/-   ##
============================================
- Coverage     77.71%   76.89%   -0.83%     
- Complexity      349      381      +32     
============================================
  Files            50       56       +6     
  Lines          1149     1277     +128     
  Branches         46       51       +5     
============================================
+ Hits            893      982      +89     
- Misses          226      264      +38     
- Partials         30       31       +1     

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[dennisgranath]

It's a bit unclear from you description whether this is a breaking change or not? I guess we don't want any breaking changes but add opentelemetry support? Is that what you mean by this?

[Abhi347]

It's a bit unclear from you description whether this is a breaking change or not? I guess we don't want any breaking changes but add opentelemetry support? Is that what you mean by this?

@dennisgranath It's not breaking change anymore since I have added the duplicated classes at their previous position and marked them as deprecated. I'll verify tomorrow if this is still going to cause some issues. Updating the description accordingly.

Update: Confirmed that it's not a breaking change.