chore(new-lintrule): improve category generation to avoid git conflicts

[Conaclos]

Summary

This PR tries to reduce git conflicts between PRs that add new lint rules.
To do that, the nursery rules in the categories.rs file are sorted.

We could also reduce conflicts in nursery.rs file by spreading the declare_group! on multiple lines.
However, I don't know how to apply formatting in the quote! macro...

Test Plan

I manually tested via just new-lintrule.

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[ematipico]

However, I don't know how to apply formatting in the quote! macro...

Rust fmt doesn't format content inside macros, that's why.

You would need to format them manually. To do so, you'd need:

• to manually sort the lines https://github.com/rome/tools/blob/main/xtask/codegen/src/generate_analyzer.rs#L178 before they are printed
• and to add a new line after each entry. Found a small snippet how to create a newline in quote! WIP: Use quote crate for generating sys bindings gtk-rs/gir#919 (comment)

[Conaclos]

@ematipico
Thanks for your help!

Actually, I don't need to sort, since it is already sorted (via file order I think).

These changes should improve the experience of contributors :)