ruff

b5d529e9 - [red-knot] Move relation methods from `CallableType` to `Signature` (#17365)

[red-knot] Move relation methods from `CallableType` to `Signature` (#17365) ## Summary This PR moves all the relation methods from `CallableType` to `Signature`. The main reason for this is that `Signature` is going to be the common denominator between normal and overloaded callables and the core logic to check a certain relationship is going to just require the information that would exists on `Signature`. For example, to check whether an overloaded callable is a subtype of a normal callable, we need to check whether _every_ overloaded signature is a subtype of the normal callable's signature. This "every" logic would become part of the `CallableType` and the core logic of checking the subtyping would exists on `Signature`.