Enable RUF013 to enforce optional typing

[cyyever]

What does this PR do?

This PR adds Optional to remaining types and add RUF013 rule to enforce that.

RUFF rule RUF013 checks for the use of implicit Optional in type annotations when the default parameter value is None.

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[Rocketknight1]

LGTM! One issue, though: We generally don't enforce type hinting. I understand that this will only enforce Optional where there is already a type hint and the default value is None, which makes a lot of sense, but I still want to check with the core maintainers @ArthurZucker and @Cyrilvallez that they're okay with a type hint style check like this!

[cyyever]

@Rocketknight1 And only when we write incomplete types that can default to None. If we don't write types for new code, the check doesn't force us to type them.