Update HttpInListener to add gRPC tags - By retrieving gRPC tag values from payload

[utpilla]

Fixes #1740

Changes

• Add a gRPC request check in the the listener OnStartActivity method to get the grpc.method value from payload and add the tag to the activity
• Possibly add grpc.status_code tag to the activity in the OnStopActivity method of the listener. Need some advice on the best way to obtain the status code from payload.

[codecov]

Codecov Report

Merging #1877 (9b568af) into main (cb066cb) will decrease coverage by 0.43%.
The diff coverage is 78.65%.

@@            Coverage Diff             @@
##             main    #1877      +/-   ##
==========================================
- Coverage   83.77%   83.33%   -0.44%     
==========================================
  Files         187      188       +1     
  Lines        5967     6134     +167     
==========================================
+ Hits         4999     5112     +113     
- Misses        968     1022      +54     

Impacted Files	Coverage Δ
src/OpenTelemetry/Sdk.cs	100.00% <ø> (ø)
src/OpenTelemetry/Logs/OpenTelemetryLogger.cs	26.82% <20.54%> (-44.60%)	⬇️
src/OpenTelemetry/Logs/LogRecord.cs	82.50% <77.77%> (-5.00%)	⬇️
...tation.AspNetCore/Implementation/HttpInListener.cs	86.23% <85.71%> (-0.34%)	⬇️
.../OpenTelemetry/Logs/OpenTelemetryLoggerProvider.cs	77.55% <88.23%> (+7.09%)	⬆️
src/OpenTelemetry/Trace/ExceptionProcessor.cs	90.90% <90.90%> (ø)
...rc/OpenTelemetry/Trace/TracerProviderBuilderSdk.cs	89.83% <91.66%> (-0.92%)	⬇️
src/OpenTelemetry/Trace/TracerProviderSdk.cs	95.16% <98.64%> (+4.38%)	⬆️
...metryProtocol/Implementation/ActivityExtensions.cs	86.89% <100.00%> (+0.05%)	⬆️
...ry.Instrumentation.AspNet/AspNetInstrumentation.cs	100.00% <100.00%> (ø)
... and 23 more

[cijothomas]

this comment is misleading. Activity.Current is modified when newOne.Start() is called itself, not at this line.

[utpilla]

Closing this PR as we are going forward with the approach of creating the new activity with the OperationName used by the framework #1879