Added finding unused imports.

[orizi]

Non-traits and impls.

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This change is 

[mkaput]

Reviewed 81 of 81 files at r1, 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Arcticae, @Draggu, @gilbens-starkware, and @piotmag769)

[gilbens-starkware]

Reviewed 81 of 81 files at r1, 3 of 3 files at r2.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @Arcticae, @Draggu, @orizi, and @piotmag769)

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crates/cairo-lang-semantic/src/db.rs line 729 at r1 (raw file):

    ) -> Maybe<Option<TraitImplId>>;
    #[salsa::invoke(items::imp::impl_all_used_items)]
    fn impl_all_used_items(

doc

Code quote:

    #[salsa::invoke(items::imp::impl_all_used_items)]
    fn impl_all_used_items(

[gilbens-starkware]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Arcticae, @Draggu, and @piotmag769)