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Rework target checking for built-in attributes This is a refactoring of target checking for built-in attributes. This PR has the following goals: - Only refactor the 80% of the attributes that are simple to target check. More complicated ones like `#[repr]` will be in a future PR. Tho I have written the code in such a way that this will be possible to add in the future. - No breaking changes. - This part of the codebase is not very well tested though, we can do a crater run if we want to be sure. - I've spotted quite a few weird situations (like I don't think an impl block should be deprecated?). We can propose fixing these to in a future PR Fixes https://github.com/rust-lang/rust/issues/143780 Fixes https://github.com/rust-lang/rust/issues/138510 I've split it in commits and left a description on some of the commits to help review. r? `@jdonszelmann`