[Instrumentation.GrpcNetClient] Move package from main repository

[Kielek]

Towards open-telemetry/opentelemetry-dotnet#5526

Changes

Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion issue #
• Changes in public API reviewed

[codecov]

Codecov Report

Attention: Patch coverage is 81.96721% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 75.85%. Comparing base (71655ce) to head (850f4f8).
Report is 224 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1704      +/-   ##
==========================================
+ Coverage   73.91%   75.85%   +1.93%     
==========================================
  Files         267      287      +20     
  Lines        9615    11181    +1566     
==========================================
+ Hits         7107     8481    +1374     
- Misses       2508     2700     +192     

Flag	Coverage Δ
unittests-Exporter.Geneva	63.38% <ø> (?)
unittests-Exporter.OneCollector	89.72% <ø> (?)
unittests-Extensions	79.33% <ø> (?)
unittests-Instrumentation.AspNet	74.69% <ø> (?)
unittests-Instrumentation.EventCounters	76.36% <ø> (?)
unittests-Instrumentation.GrpcNetClient	81.96% <81.96%> (?)
unittests-Instrumentation.Http	81.79% <ø> (?)
unittests-Instrumentation.Owin	83.43% <ø> (?)
unittests-Instrumentation.Process	100.00% <ø> (?)
unittests-Instrumentation.Runtime	100.00% <ø> (?)
unittests-Instrumentation.SqlClient	90.90% <ø> (?)
unittests-Instrumentation.StackExchangeRedis	71.00% <ø> (?)
unittests-Instrumentation.Wcf	78.47% <ø> (?)
unittests-PersistentStorage	65.78% <ø> (?)
unittests-ResourceDetectors.Azure	81.53% <ø> (?)
unittests-ResourceDetectors.Host	54.11% <ø> (?)
unittests-ResourceDetectors.Process	100.00% <ø> (?)
unittests-ResourceDetectors.ProcessRuntime	76.08% <ø> (?)
unittests-Solution	80.17% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...ntation.GrpcNetClient/GrpcClientInstrumentation.cs	100.00% <100.00%> (ø)
...NetClient/GrpcClientTraceInstrumentationOptions.cs	100.00% <100.00%> (ø)
...n.GrpcNetClient/TracerProviderBuilderExtensions.cs	100.00% <100.00%> (ø)
...try.Instrumentation.GrpcNetClient/GrpcTagHelper.cs	95.65% <95.65%> (ø)
...t/Implementation/GrpcInstrumentationEventSource.cs	53.84% <53.84%> (ø)
...ent/Implementation/GrpcClientDiagnosticListener.cs	76.19% <76.19%> (ø)

... and 244 files with indirect coverage changes