PassThru TableNameMappings using the logger category name.

[Yun-Ting]

Related to:
#289
When the PassThruTableNameMappings rule was enable, the best fit table name given the category name were being generated while serializing each LogRecord.

Next steps:

• Add benchmarks to compare perf w/ and w/o cache.
  [Not for merging] Benchmarks for PassThruTableMappings. Yun-Ting/opentelemetry-dotnet-contrib#1
  PassThru TableNameMappings using the logger category name. #288 (comment)

  baseline (main branch)
  * Total Loops: 1,106,043,741
  * Average Loops/Second: 3,057,844
  * Average CPU Cycles/Loop: 6,867
  
  No Cache with passThruTableMappings Enabled
  * Total Loops: 878,389,049
  * Average Loops/Second: 2,912,971
  * Average CPU Cycles/Loop: 7,193
  
  With Cache with passThruTableMappings Enabled
  * Total Loops: 889,221,235
  * Average Loops/Second: 2,904,167
  * Average CPU Cycles/Loop: 7,196
  

• Document use cases for this feature. => Will be addressed in a follow-up PR.

• Add testcase for Linux environment.

• Determine the behavior of Sanitize when the category name is invalid. => When the category name is invalid, eventName will be assigned as null. GenevaExporter will not pick up events with null eventNames.

[codecov]

Codecov Report

Merging #345 (d849ec8) into main (0a03cfc) will increase coverage by 0.74%.
The diff coverage is 98.03%.

@@            Coverage Diff             @@
##             main     #345      +/-   ##
==========================================
+ Coverage   21.96%   22.70%   +0.74%     
==========================================
  Files         144      144              
  Lines        4421     4465      +44     
==========================================
+ Hits          971     1014      +43     
- Misses       3450     3451       +1     

Impacted Files	Coverage Δ
...penTelemetry.Exporter.Geneva/GenevaBaseExporter.cs	96.77% <80.00%> (-1.48%)	⬇️
...OpenTelemetry.Exporter.Geneva/GenevaLogExporter.cs	91.46% <100.00%> (+1.58%)	⬆️
...Telemetry.Exporter.Geneva/MessagePackSerializer.cs	92.75% <100.00%> (+0.21%)	⬆️

[utpilla]

Approved with some suggestions.

[CodeBlanch]

LGTM

[reyang]

LGTM with a changelog entry.