Extend config option similar to package.json prettier field

Request

Could we get a field to specify a rustfmt.toml configuration either within cargo.toml or rustfmt.toml

example:

#cargo.toml

rustfmt-extends = { git = "https://github.com/some-global-rustfmt-config", branch = "main" }

Rational

I'm working on multiple backend micro-services in rust. In every single repo I'd like to have the exact same styling / formatting. Currently I'm copying over the rustfmt.toml file to each repo and if there's a configuration change I or someone else on my team makes we end up copying over the new file to all the repos. Ideally it would be nice if we could just point to a github repo and a rustfmt.toml and have cargo pull it down and rustfmt use it.

This is similar to what formatters like prettier allow for frontend repos. (ex. npm i some-prettier-config)

The request names Cargo.toml and rustfmt.toml but no source files or tests. Start by reviewing existing rustfmt configuration discovery and Cargo manifest handling; done means a shared remote configuration can be declared and used consistently, with behavior and failure cases covered.