Misc changes to clippy_config

[Jarcho]

Contains part of #13084

Changes include:

• Sort config list and each configs lint list.
• Add default text for the two configs that were missing it.
• Switch the lint list in the configs to an attribute.
• Make dev fmt sort the config list.

r? @xFrednet

changelog: none

[flip1995]

This is so nice! Thanks!

[xFrednet]

The changes to the macro look more than good to me. I really like the changes to declare the lints via attributes.

I'm not quite sure about the cargo dev fmt changes. It's cool, that it actually formats the whole thing and not just errors like rustc's tidy does. The downside is, that it feels like the custom format adds a lot of complexity. Future changes to the Conf! macro will likely also require some adaption of the formatting code.

I can't make up my mind about this rn. If you think that this is better than reusing tidy or rolling a simpler error on non alphabet check, I'd trust you.

[xFrednet]

Okay, I'm gonna R+ this now. Usually, I wouldn't have mentioned the sorted -> unstable_sorted nit since it's very nitpicky with such a change. But I thought it was mention worthy in case another change would have been needed.

---

roses are Red,
Biolets are Vlue,
Uan you Cnderstand,
this weird writing Too?

[bors]

📌 Commit 78a750e has been approved by xFrednet

It is now in the queue for this repository.

[bors]

⌛ Testing commit 78a750e with merge 3b64ca9...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: xFrednet
Pushing 3b64ca9 to master...

[xFrednet]

@rust-lang/clippy Small FYI: This PR changed the syntax of the define_Conf! macro.

The configs now roughly look like this:

/// Which crates to allow absolute paths from
#[lints(absolute_paths)]
absolute_paths_allowed_crates: FxHashSet<String> = FxHashSet::default(),

I like this change. Thank you to @Jarcho for this change :D