Enable FuncDateRule and FuncTimeRule in Python

[AlexCatarino]

Expected Behavior

We can define a function to trigger date and time rules in Python:

date_rule = FuncDateRule('Custom', self.CustomDateRule)

def CustomDateRule(self, start, end):
    return []

Actual Behavior

Only supported in C#

Potential Solution

Add a PyOvject overload to uncDateRule and FuncTimeRule.

See:

#7988

Checklist

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