[pkg/ottl] Add OTTL LEEF Parser #44909
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Description
Adds a new OTTL func to parse LEEF format log data.
Link to tracking issue
Fixes #44908, also mentioned in #37442
Testing
Adds unit testing for LEEF format logs, including sample event messages provided by IBM to ensure integration with QRadar:
https://www.ibm.com/docs/en/dsm?topic=guardium-sample-event-messages
Documentation
Updates the OTTL function readme, changelog entry added.