Git-recover extension

Thank you for this amazing script. I'm using it on a daily basis.

Recently, I stumbled on [git-recover](https://github.com/ethomson/git-recover) and I extended your `fzf-git.sh` script with support for searching orphaned git objects, i.e., facilitating for git file recoveries, see [fzf-git-recover](https://github.com/mheuvel-dev/fzf-git-recover).

Are you interested in merging this feature into this script?
I can imagine that you don't like to depend on `git-recover`. I could make it an optional dependency if you wish.

I'm happy to contribute this piece of script, but I also don't mind to maintain a separate `fzf-git-recover` mini repository. No rush for a decision, no hard feelings and I appreciate your opinion.

Keep up the good work!

Start by reading fzf-git.sh and the linked fzf-git-recover project, then compare how git-recover searches orphaned Git objects with the existing bindings. The open question is whether to integrate this as an optional dependency or keep it separate; done requires an agreed integration scope and corresponding implementation.

Written by the indexing model from the issue text.