Applied the dependency injection pattern to OtlpExporter

[CodeBlanch]

Changes

Applied the dependency injection pattern from #1889 to OtlpExporter.

TODOs

• CHANGELOG.md updated for non-trivial changes

[codecov]

Codecov Report

Merging #1942 (89bb51b) into main (5bf2b42) will decrease coverage by 0.11%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main    #1942      +/-   ##
==========================================
- Coverage   83.67%   83.55%   -0.12%     
==========================================
  Files         192      192              
  Lines        6167     6172       +5     
==========================================
- Hits         5160     5157       -3     
- Misses       1007     1015       +8     

Impacted Files	Coverage Δ
...metryProtocol/OtlpTraceExporterHelperExtensions.cs	72.22% <33.33%> (-20.09%)	⬇️
...ZPages/Implementation/ZPagesExporterEventSource.cs	56.25% <0.00%> (-6.25%)	⬇️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	76.47% <0.00%> (-5.89%)	⬇️
...ter.ZPages/Implementation/ZPagesActivityTracker.cs	97.14% <0.00%> (-2.86%)	⬇️