Auto merge of #92086 - petrochenkov:modchild, r=jackh726

rustc_metadata: Optimize and document module children decoding

The first commit limits the item in the `item_children`/`each_child_of_item` query to modules (in name resolution sense) and adds a corresponding assertion.
The `associated_item_def_ids` query collecting children of traits and impls specifically now uses a simplified implementation not decoding unnecessary data instead of `each_child_of_item`, this gives a nice performance improvement.

The second commit does some renaming that clarifies the terminology used for all items in a module vs `use` items only.

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