Refactored ConsoleExporter

[utpilla]

Changes

• Refactored ConsoleExporter generic class to get rid of type specific check
• Added ConsoleActivityExporter and ConsoleLogRecordExporter classes

[utpilla]

@CodeBlanch It'd be great if you could take a look at this and let me know of what you think. This is in regards to this discussion: #1438 (comment)

[utpilla]

@cijothomas @reyang I would love to get any suggestions for this.

[codecov]

Codecov Report

Merging #1590 (2facdf3) into master (b710c31) will decrease coverage by 0.10%.
The diff coverage is 2.94%.

@@            Coverage Diff             @@
##           master    #1590      +/-   ##
==========================================
- Coverage   80.74%   80.64%   -0.11%     
==========================================
  Files         242      244       +2     
  Lines        6544     6555      +11     
==========================================
+ Hits         5284     5286       +2     
- Misses       1260     1269       +9     

Impacted Files	Coverage Δ
...emetry.Exporter.Console/ConsoleActivityExporter.cs	0.00% <0.00%> (ø)
.../OpenTelemetry.Exporter.Console/ConsoleExporter.cs	21.42% <0.00%> (+16.51%)	⬆️
...xporter.Console/ConsoleExporterHelperExtensions.cs	0.00% <0.00%> (ø)
...porter.Console/ConsoleExporterLoggingExtensions.cs	0.00% <0.00%> (ø)
...metry.Exporter.Console/ConsoleLogRecordExporter.cs	0.00% <0.00%> (ø)
....Exporter.Jaeger/JaegerExporterHelperExtensions.cs	15.38% <0.00%> (-17.95%)	⬇️
...Telemetry.Exporter.Jaeger/JaegerExporterOptions.cs	100.00% <100.00%> (ø)

[CodeBlanch]

@utpilla I like it! I think this is definitely a more standard use of generics. Could probably clean it up even further like...

public abstract class ConsoleExporter<T> : BaseExporter<T>
{
   public override ExportResult Export(in Batch<T> batch)
   {
      foreach (var item in batch)
      {
         ExportItem(item);
      }
   }

   protected abstract void ExportItem(T item);

   protected void WriteLine(string message) { /* Existing code goes here*/ }
}

internal class ConsoleActivityExporter : ConsoleExporter<Activity>
{
   protected override void ExportItem(Activity item)
   {
      WriteLine($"Activity.Id:          {activity.Id}");
      /* Etc. */
   }
}

Tweaks: Made ConsoleExporter abstract, switched the action to an abstract method, and made WriteLine protected so super can call it.

[utpilla]

I have created a new PR #1593 with the suggested changes.