git_handler: support extracting metadata from Git extra fields
Git has a well-hidden notion of extra fields. They aren't accessible from the CLI, but Dulwich can create them. They're a better place to store Mercurial's extra metadata than the commit message. An upcoming patch will switch hg-git to saving the metadata in the Git extra fields. This commit: (a) prepares for that (b) extracts other Git extra fields so that commits from Git with such fields roundtrip correctly
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