Deprecate Zipkin exporter

[michaeljohnalbers]

Deprecates the Zipkin exporter and removes all dependencies on internal classes. This involved copying several classes into a sub-package of the Zipkin exporter package. There is a README.md in this package with a short explanation. Several test classes had to be updated to handle the deprecation.

• Closes Deprecate zipkin exporter #7863

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: michaeljohnalbers / name: Michael Albers (3ef07e3, 5c1ee8b, 6bc46a9)

[codecov]

Codecov Report

❌ Patch coverage is 85.67416% with 51 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.07%. Comparing base (62049e7) to head (5c1ee8b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ipkin/internal/copied/ExporterInstrumentation.java	69.64%	12 Missing and 5 partials ⚠️
.../zipkin/internal/copied/LegacyExporterMetrics.java	75.00%	10 Missing and 5 partials ⚠️
...zipkin/internal/copied/SemConvExporterMetrics.java	92.94%	1 Missing and 5 partials ⚠️
...porter/zipkin/internal/copied/ExporterMetrics.java	71.42%	2 Missing and 2 partials ⚠️
...er/zipkin/internal/copied/NoopExporterMetrics.java	0.00%	4 Missing ⚠️
...y/exporter/zipkin/internal/copied/ComponentId.java	82.35%	1 Missing and 2 partials ⚠️
...emetry/exporter/zipkin/internal/copied/Signal.java	91.66%	1 Missing ⚠️
...orter/zipkin/internal/copied/ThrottlingLogger.java	97.72%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7974      +/-   ##
============================================
- Coverage     90.15%   90.07%   -0.09%     
- Complexity     7476     7557      +81     
============================================
  Files           836      848      +12     
  Lines         22550    22905     +355     
  Branches       2224     2259      +35     
============================================
+ Hits          20331    20631     +300     
- Misses         1515     1550      +35     
- Partials        704      724      +20     

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