Add taploFmt TOML format function to mkLib

[eureka-cpu]

Motivation

Closes #673

Hello, this change adds a function to mkLib for checking formatting of TOML files. TOML files are extremely common, especially among Rust projects, and I find that in all of my use cases of crane between projects I am always manually adding checks for the formatting of Cargo.toml files, and other files such as deny.toml, rust-toolchain.toml, rustfmt.toml and so on.

I have a working copy of this on a local project, otherwise I wasn't sure how to add tests for it. I'm also sure that the copy-pasted code I took from cargoFmt.nix may include some things that don't belong, or may otherwise be going about it the wrong way. Regardless, this is what worked for me, please do instruct me on how to get this to a mergable state, I would greatly appreciate it!

Checklist

• added tests to verify new behavior (toml format is added to checks so it is already tested in CI)
• added an example template or updated an existing one
• updated docs/API.md (or general documentation) with changes
• updated CHANGELOG.md

[ipetkov]

Hi @eureka-cpu thanks for the PR!

Although I haven't seen the broader Rust community standardize on a toml formatter, this is is pretty self contained so I'm open to including it!

The last thing we need to do before merging this is updating the API docs to document how taploFmt works! You can adapt the existing docs for cargoFmt since they're very similar

[eureka-cpu]

Hi @eureka-cpu thanks for the PR!

Although I haven't seen the broader Rust community standardize on a toml formatter, this is is pretty self contained so I'm open to including it!

The last thing we need to do before merging this is updating the API docs to document how taploFmt works! You can adapt the existing docs for cargoFmt since they're very similar

Thanks for the review! I'll have those changes up shortly (:

[ipetkov]

Thanks again for the contribution!