[Part2] Support Activity Status and status description in Jaeger Exporter.

[Yun-Ting]

Fixes parts of #2569.
Related to: #3003
Background : Please review Console.Exporter where the same logic were exercised: #3061.

Added support for Activity.Status/Description in Jaeger.Exporter.
System.Diagnostic.DiagnosticSource version 6.0.0 introduced native support for storing status/description in the Activity itself.

This PR modified the exporter to retrieve status from the newly added fields if it was set.
To maintain backward compatibility, the control flow would fell back to retrieve status from the activity.Tags if the native status/description were not set.

In order to support Activity Status takes precedence over Activity Tags, the logic that were in ProcessJaegerTag were extracted to be inside ForEach() method of TagEnumerationState.

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

Merging #3073 (a35fff7) into main (f531391) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3073      +/-   ##
==========================================
+ Coverage   84.75%   84.77%   +0.02%     
==========================================
  Files         259      259              
  Lines        9142     9170      +28     
==========================================
+ Hits         7748     7774      +26     
- Misses       1394     1396       +2     

Impacted Files	Coverage Δ
....Jaeger/Implementation/JaegerActivityExtensions.cs	96.40% <100.00%> (+1.44%)	⬆️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	73.52% <0.00%> (-8.83%)	⬇️

[reyang]

LGTM.

[cijothomas]

Blocking to address the issue : https://github.com/open-telemetry/opentelemetry-dotnet/pull/3073/files#r833442567