Add Unit Tests for Logs

[utpilla]

Changes

• Added Unit Tests for Logs
• Update SamplingDecision enum values description to use Activity.Recorded instead of Activity.IsRecorded

[codecov]

Codecov Report

Merging #1613 (5caceda) into master (fc8520a) will increase coverage by 1.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1613      +/-   ##
==========================================
+ Coverage   80.68%   81.82%   +1.14%     
==========================================
  Files         245      245              
  Lines        6575     6575              
==========================================
+ Hits         5305     5380      +75     
+ Misses       1270     1195      -75     

Impacted Files	Coverage Δ
...orter.InMemory/InMemoryExporterHelperExtensions.cs	60.00% <0.00%> (+60.00%)	⬆️
.../OpenTelemetry/Logs/OpenTelemetryLoggerProvider.cs	70.45% <0.00%> (+70.45%)	⬆️
src/OpenTelemetry/Logs/OpenTelemetryLogger.cs	71.42% <0.00%> (+71.42%)	⬆️
...c/OpenTelemetry/Logs/OpenTelemetryLoggerOptions.cs	80.00% <0.00%> (+80.00%)	⬆️
...enTelemetry/Logs/OpenTelemetryLoggingExtensions.cs	85.71% <0.00%> (+85.71%)	⬆️
src/OpenTelemetry/Logs/LogRecord.cs	87.50% <0.00%> (+87.50%)	⬆️

[cijothomas]

Thanks for adding test coverage for Logs!

Okay to merge, no product change.