Support `--ignore-rev` in `gix-blame`

[cruessler]

https://git-scm.com/docs/git-blame#Documentation/git-blame.txt---ignore-revrev

There’s also --ignore-revs-file. I don’t know yet whether it makes more sense to tackle both flags in a single PR or separately, starting with --ignore-rev. My current hypothesis is that starting with --ignore-rev would make the task easier, though.

[Byron]

Thanks for bringing this up!

It looks like gix-blame would also need another option or parameter to learn about and respect the revisions to ignore. This could be one PR.
A follow-up could deal with the command-line, and there I think it's fine to implement both flags right away, it should be easy enough.