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Parse Git commit trailers when processing commits

Yorick Peterse requested to merge parsing-commit-trailers into master

This adds support for parsing Git trailers (https://git-scm.com/docs/git-interpret-trailers). GitLab will use these trailers to generate changelog information, as part of the epic gitlab-com/gl-infra&351 (closed).

Parsing is done by parsing the output of git log when finding multiple commits, and by parsing the output of git show when finding a single commit. The Go parser is written such that it allocates as few objects as possible, making it possible to efficiently parse trailers; even when listing thousands of commits.

See gitlab-com/gl-infra/delivery#1364 (closed) for more information.

Edited by Yorick Peterse

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