[FEATURE REQUEST] retry_unless_exception_cause_type

[rgullik1]

retry_if_exception_cause_type is an useful retry_base class but the inverted variant is missing.
It would be nice to have a retry_base class that retries if the exception is anything other than the specified exception(s).

An alternative is to implement an __invert_ overload on retry_base but not sure how viable that is.

[Kitan-Dara06]

Hey @rgullik1, I'd love to implement retry_unless_exception_cause_type mirroring the existing retry_unless_exception_type logic. I can get a PR up for this today.