Zipkin exporter: Serialize EventData attributes as JSON

[breedx-splk]

Resolves #4859.

[codecov]

Codecov Report

Base: 91.00% // Head: 91.02% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (23425af) compared to base (e814602).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4934      +/-   ##
============================================
+ Coverage     91.00%   91.02%   +0.01%     
- Complexity     4839     4847       +8     
============================================
  Files           546      547       +1     
  Lines         14439    14455      +16     
  Branches       1395     1396       +1     
============================================
+ Hits          13140    13157      +17     
+ Misses          894      893       -1     
  Partials        405      405              

Impacted Files	Coverage Δ
...lemetry/exporter/zipkin/EventDataToAnnotation.java	100.00% <100.00%> (ø)
...y/exporter/zipkin/OtelToZipkinSpanTransformer.java	92.00% <100.00%> (+0.10%)	⬆️
...y/exporter/internal/marshal/CodedOutputStream.java	69.82% <0.00%> (-1.19%)	⬇️
...emconv/resource/attributes/ResourceAttributes.java	100.00% <0.00%> (ø)
...try/exporter/zipkin/ZipkinSpanExporterBuilder.java	97.72% <0.00%> (ø)
...exporter/jaeger/JaegerGrpcSpanExporterBuilder.java	80.64% <0.00%> (ø)
...opentelemetry/opentracingshim/SpanBuilderShim.java	89.14% <0.00%> (+0.86%)	⬆️
...ava/io/opentelemetry/opentracingshim/SpanShim.java	88.49% <0.00%> (+0.88%)	⬆️
...ava/io/opentelemetry/sdk/internal/RateLimiter.java	100.00% <0.00%> (+5.88%)	⬆️

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[jack-berg]

Thanks for taking care of this! Couple of small comments.