[Proposal] Add Rust to Git formulae

[tvuotila]

Some features of Git require Rust at compilation time. I encountered it while trying to do the following:

mkdir example
cd example
git init --object-format=sha256
git config extensions.compatObjectFormat sha1
git commit --allow-empty --message "Empty"

The output is simply:

fatal: compatibility hash algorithm support requires Rust

Am I stuck with building Git from source. Git documentation says Rust is automatically enabled on Git 2.55 and needs to be disabled explicitly. Git 3.0 will make the Rust mandatory. For context, currently Homebrew installs Git 2.54.0.

[carlocab]

The compatObjectFormat feature is currently very experimental and doesn't seem complete enough to justify adding a build dependency to Rust today. We can revisit that when the feature matures.

[cwebdesign]

Please keep (the option for) Rust-free git on Homebrew. thank you,

[ZhongRuoyu]

Note that Rust will be mandatory in Git 3.0 (https://git-scm.com/docs/BreakingChanges#_git_3_0), so Rust features will probably be enabled by then if not sooner.