lint/tidy check imports of rustc_type_ir and rustc_middle

`rustc_middle` reexports all of `rustc_type_ir` and should be preferred in case it is available. We should lint if a crate depends on both `rustc_middle` and `rustc_type_ir` and rewrite all existing uses of `rustc_type_ir` in such crates to use `rustc_middle::ty` instead.

cc @compiler-errors 