chore: 0.2.0 release proposal

[mayurkale22]

Draft Release Notes: https://github.com/open-telemetry/opentelemetry-js/releases/tag/untagged-89b4e1d7d95707e2800f

[mayurkale22]

/cc @obecny @draffensperger @dyladan

[codecov-io]

Codecov Report

Merging #479 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #479      +/-   ##
=========================================
- Coverage   95.27%   95.2%   -0.08%     
=========================================
  Files         133     136       +3     
  Lines        6820    6796      -24     
  Branches      578     594      +16     
=========================================
- Hits         6498    6470      -28     
- Misses        322     326       +4

Impacted Files	Coverage Δ
...core/src/context/propagation/BinaryTraceContext.ts	96.72% <0%> (-3.28%)	⬇️
...telemetry-core/src/context/propagation/B3Format.ts	96% <0%> (-0.16%)	⬇️
...entelemetry-exporter-jaeger/test/transform.test.ts	100% <0%> (ø)	⬆️
...opentelemetry-base/test/resources/resource.test.ts	100% <0%> (ø)	⬆️
...ges/opentelemetry-exporter-zipkin/src/transform.ts	100% <0%> (ø)	⬆️
...telemetry-plugin-grpc/test/utils/assertionUtils.ts	100% <0%> (ø)	⬆️
.../opentelemetry-exporter-zipkin/test/zipkin.test.ts	100% <0%> (ø)	⬆️
...pe-async-hooks/test/AsyncHooksScopeManager.test.ts	100% <0%> (ø)	⬆️
.../opentelemetry-exporter-jaeger/test/jaeger.test.ts	100% <0%> (ø)	⬆️
...telemetry-scope-base/test/NoopScopeManager.test.ts	100% <0%> (ø)	⬆️
... and 6 more