Add Iterators as acceptable arguments to functions

[aquacash5]

Allow users to use generator expressions as arguments to z3 objects.

I think it makes the syntax a little cleaner. Removes a lot of those square brackets.

Examples:

s = Solver()

X = [[Int(f"{row} {col}") for col in range(9)] for row in range(9)]

s.add(Distinct(row) for row in X)
# vs
s.add([Distinct(row) for row in X])