Add Optional.filter to the Standard Library

I feel like the original pitch was much more to the point. I don’t think it’s necessary to muddy the waters with excessive motivation discussion and alternative considered sections that only invite confusion. This pitch isn’t about inventing a novel solution to Swift specific problem. This is about including the batteries. :battery:
@AlexanderM I advise you significantly down pair the proposal: Short description and reference to the plethora of prior art is all that’s needed here.

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