[Exporter.Geneva] Refactor GenevaExporter

[utpilla]

Changes

• Refactor GenevaTraceExporter and GenevaLogExporter to make their behavior configurable in the ctor
• This would allow us switch from MsgPack to TLD later on
• Moved the classes with extension methods outside of the MsgPackExporter folder

[codecov]

Codecov Report

Merging #649 (b400805) into main (58cf8d7) will decrease coverage by 0.03%.
The diff coverage is 76.81%.

❗ Current head b400805 differs from pull request most recent head b95b643. Consider uploading reports for the commit b95b643 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #649      +/-   ##
==========================================
- Coverage   77.78%   77.74%   -0.04%     
==========================================
  Files         171      173       +2     
  Lines        5158     5191      +33     
==========================================
+ Hits         4012     4036      +24     
- Misses       1146     1155       +9     

Impacted Files	Coverage Δ
....Exporter.Geneva/GenevaExporterHelperExtensions.cs	58.33% <ø> (ø)
...lemetry.Exporter.Geneva/GenevaLoggingExtensions.cs	85.71% <ø> (ø)
...ter.Geneva/MsgPackExporter/MsgPackTraceExporter.cs	92.89% <69.23%> (ø)
...orter.Geneva/MsgPackExporter/MsgPackLogExporter.cs	93.75% <75.00%> (ø)
...OpenTelemetry.Exporter.Geneva/GenevaLogExporter.cs	80.00% <80.00%> (ø)
...enTelemetry.Exporter.Geneva/GenevaTraceExporter.cs	80.00% <80.00%> (ø)
...er.Geneva/MsgPackExporter/MessagePackSerializer.cs	92.27% <0.00%> (-0.49%)	⬇️

[reyang]

LGTM.