Auto merge of #92441 - cjgillot:resolve-trait-impl-item, r=matthewjasper

Auto merge of #92441 - cjgillot:resolve-trait-impl-item, r=matthewjasper

Link impl items to corresponding trait items in late resolver.

Hygienically linking trait impl items to declarations in the trait can be done directly by the late resolver. In fact, it is already done to diagnose unknown items.

This PR uses this resolution work and stores the `DefId` of the trait item in the HIR. This avoids having to do this resolution manually later.

r? `@matthewjasper`
Related to #90639. The added `trait_item_id` field can be moved to `ImplItemRef` to be used directly by your PR.