Record Git hash of library release in index

[per1234]

Describe the request

Record the Git hash of the release's tag in the libraries index.

🙂 It will be possible to conclusively ascertain which point in a library's Git revision history corresponds to a release in the index.

Describe the current behavior

The only versioning information available about a library release is the version number.

It is a common problem for library maintainers to forget to update the value of the version property in the library metadata before pushing a Git tag.

Significant effort is made in the libraries-repository-engine codebase to process Git tags in ascending chronological order, but this is not guaranteed.

Library maintainers sometimes later move published tags, or delete tags.

🙁 There may be ambiguity regarding exactly which point in a library's Git revision history corresponds to a release in the index.

libraries-repository-engine version

19f9d91

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