examples(tracing): add multi exporter example

[mayurkale22]

Which problem is this PR solving?

• Closes Provide example of export to multiple backends #532

[mayurkale22]

/cc @naseemkullah

[markwolff]

LGTM. Would we want to expose this in the package.json?

[naseemkullah]

Thanks @mayurkale22 !

And

// It is recommended to use SimpleSpanProcessor in case of Jaeger exporter as
// it's internal client already handles the spans with batching logic.

is good to know! Should be added to Jaeger Exporter doc if there is any.

[mayurkale22]

LGTM. Would we want to expose this in the package.json?

Good catch, done.

[codecov-io]

Codecov Report

Merging #537 into master will decrease coverage by 2.29%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #537     +/-   ##
=========================================
- Coverage    92.4%   90.11%   -2.3%     
=========================================
  Files         152      150      -2     
  Lines        7495     7397     -98     
  Branches      649      661     +12     
=========================================
- Hits         6926     6666    -260     
- Misses        569      731    +162

Impacted Files	Coverage Δ
...pentelemetry-core/test/internal/validators.test.ts	50% <0%> (-50%)	⬇️
...elemetry-core/test/trace/spancontext-utils.test.ts	55.55% <0%> (-44.45%)	⬇️
...lemetry-core/test/trace/ProbabilitySampler.test.ts	56.52% <0%> (-43.48%)	⬇️
...s/opentelemetry-core/test/trace/NoopTracer.test.ts	60% <0%> (-40%)	⬇️
...s/opentelemetry-core/test/context/B3Format.test.ts	63.39% <0%> (-36.61%)	⬇️
...ges/opentelemetry-core/test/trace/NoopSpan.test.ts	63.63% <0%> (-36.37%)	⬇️
...s/opentelemetry-core/test/trace/tracestate.test.ts	65.06% <0%> (-34.94%)	⬇️
...ntelemetry-core/test/trace/NoRecordingSpan.test.ts	71.42% <0%> (-28.58%)	⬇️
...ackages/opentelemetry-core/src/platform/node/id.ts	71.42% <0%> (-28.58%)	⬇️
...entelemetry-core/test/common/ConsoleLogger.test.ts	77.01% <0%> (-22.99%)	⬇️
... and 37 more

[mayurkale22]

is good to know! Should be added to Jaeger Exporter doc if there is any.

I found it here, not mentioned in the official docs.