add convenience methods for common Git trailers #2030
Merged
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This PR implements convenient methods for extracting commit authors from trailers as suggested in issue #1804.
The main changes are adding case-insensitive detection methods to TrailerRef for common trailer types like signed-off-by and co-authored-by, along with filtering methods on the Trailers iterator and high-level convenience methods on CommitRef to easily extract all authors from squashed commits that contain multiple contributors.