feat: Replace Zipkin pipeline with exporter builders

[gruebel]

Fixes #2473

Changes

• I tried to make it similar to feat: replace OtlpPipeline with exporter builders #2221

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 79.6%. Comparing base (144fdd9) to head (7afb76b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-zipkin/src/exporter/mod.rs	0.0%	12 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #2565     +/-   ##
=======================================
+ Coverage   79.4%   79.6%   +0.2%     
=======================================
  Files        118     118             
  Lines      22526   22464     -62     
=======================================
- Hits       17898   17897      -1     
+ Misses      4628    4567     -61     

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[cijothomas]

Looks good overall.
Need to address fixing the example (to show the global set provider) and async_trait before merge.

Thanks for helping!

[cijothomas]

Thank you!