Rollup merge of #125572 - mu001999-contrib:dead/enhance, r=pnkfelix

Detect pub structs never constructed and unused associated constants

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Lints never constructed public structs.

If we don't provide public methods to construct public structs with private fields, and don't construct them in the local crate. They would be never constructed. So that we can detect such public structs.

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Update:

Also lints unused associated constants in traits.

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