addSpanExporter api

[nelsitoPuglisi]

Goal

Adds a public api that allows a client app to add a SpanExporter at runtime, through a OpenTelemetryConfiguration class.

Testing

Added instrumentation tests to SpanTests class.

Release Notes

New addSpanExporter public api, to add many SpanExporters to the OTel SDK.

WHAT:We have created an api to add SpanExporters to the OTel SDK
WHY:To allow customers to export their data to any OTel Collector.
WHO:Any customer with an OTel collector.

[nelsitoPuglisi]

Current dependencies on/for this PR:

• master
  • PR add Resource with service.name and service.version #375
    • PR addSpanExporter api #377 👈
    • PR adds a CompositeSpanExporter #376

This stack of pull requests is managed by Graphite.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (44428e8) 79.00% compared to head (9ec1dca) 79.05%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #377      +/-   ##
==========================================
+ Coverage   79.00%   79.05%   +0.04%     
==========================================
  Files         350      351       +1     
  Lines        9731     9744      +13     
  Branches     1453     1454       +1     
==========================================
+ Hits         7688     7703      +15     
+ Misses       1462     1459       -3     
- Partials      581      582       +1     

Files	Coverage Δ
...ava/io/embrace/android/embracesdk/EmbraceImpl.java	57.97% <100.00%> (+0.11%)	⬆️
...ndroid/embracesdk/injection/OpenTelemetryModule.kt	100.00% <100.00%> (ø)
...acesdk/opentelemetry/OpenTelemetryConfiguration.kt	100.00% <100.00%> (ø)
...droid/embracesdk/opentelemetry/OpenTelemetrySdk.kt	88.23% <100.00%> (ø)
...in/java/io/embrace/android/embracesdk/Embrace.java	54.21% <50.00%> (-0.06%)	⬇️

... and 1 file with indirect coverage changes