feat(pack): update `get()` to take `rev` from actual repo if `info=true`

Problem: `vim.pack.get()` always uses lockfile as the source for the
  `rev` field. This is fast, but may be misleading in case of
  a corrupted lockfile.

Solution: Compute revision from Git repo on disk if `info=true`
  (default), use lockfile otherwise. This does increase execution time
  (as a result of one extra `git ...` call for every plugin), but
  `info=true` is already designed to be informative and not necessarily
  fast.

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