[DebugExporter] Add EventName from LogRecord to output

[cijothomas]

Description

1. Adds event name from LogRecord to debug exporter.
2. Also modified the example config file to include logs too. (It only had traces/metrics). Not really required for this change, but hope that is okay to club into same PR!

Link to tracking issue

Fixes #11966

Testing

Manually tested with Otel client that exported a LogRecord with event name and without event name.

(1st time contributor here, still learning the process.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.62%. Comparing base (ffcef93) to head (653f703).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11967   +/-   ##
=======================================
  Coverage   91.62%   91.62%           
=======================================
  Files         447      447           
  Lines       23739    23741    +2     
=======================================
+ Hits        21751    21753    +2     
  Misses       1613     1613           
  Partials      375      375           

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[cijothomas]

@codeboten The changelog CI check looks broken, unrelated to this PR. Could you help fix that, so this PR can have its CI check pass.