Add event_name as a top level field in the LogRecord.
          #4652
        
          
      
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Description
event_namewas added to the log proto as a top level field: https://github.com/open-telemetry/opentelemetry-proto/releases/tag/v1.6.0We need to wait for #4645 to merge which upgrades the proto in this repo passed 1.5.
Also see open-telemetry/opentelemetry-specification#4260
This PR adds it to the API/SDK / LogRecord -> proto conversion function.
Fixes #4644
Type of change
How Has This Been Tested?
Unit tests
Does This PR Require a Contrib Repo Change?
Once this PR makes it into a release, I plan to update instrumentations using events to instead use the logs SDK and set this field in the log instead of using the deprecated events SDK.
Checklist: