Adds `<module::Type>::method` support and makes `module::Type::method` a shorthand for it. This is most of #16293, except that chaining multiple associated types is not yet supported. It also fixes #22563 as `impl`s are no longer treated as modules in resolve. Unfortunately, this is still a *[breaking-change]*: * If you used a global path to a primitive type, i.e. `::bool`, `::i32` etc. - that was a bug I had to fix. Solution: remove the leading `::`. * If you passed explicit `impl`-side type parameters to an inherent method, e.g.: ```rust struct Foo<T>(T); impl<A, B> Foo<(A, B)> { fn pair(a: A, b: B) -> Foo<(A, B)> { Foo((a, b)) } } Foo::<A, B>::pair(a, b) // Now that is sugar for: <Foo<A, B>>::pair(a, b) // Which isn't valid because `Foo` has only one type parameter. // Solution: replace with: Foo::<(A, B)>::pair(a, b) // And, if possible, remove the explicit type param entirely: Foo::pair(a, b) ``` * If you used the `QPath`-related `AstBuilder` methods @hugwijst added in #21943. The methods still exist, but `QPath` was replaced by `QSelf`, with the actual path stored separately. Solution: unpack the pair returned by `cx.qpath` to get the two arguments for `cx.expr_qpath`.

Don't require impls next to structs #22563

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