Return correct types for Question.ask

[alex-way]

Describe the problem

Question.ask is typed as Any which makes me sad.

Describe the solution

I've not had a massive look through the codebase but the immediate solution seems to be turning Question into a generic so we can type the return Type:

class Question(Generic[T]):
    def ask(self) -> T
---
def checkbox(...) -> Question[list[str]]:
    ...

I'll see if I can provide a pull request.

Alternatives considered

No response