[issue37128] Add math.perm()

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> +0 from me.  It is inevitable that this will be requested now that we have comb().

Exactly my thoughts, too. I don't think I'll have any use for `math.perm`; the main reason to add it will be to satisfy all those who got taught combinations and permutations at the same time, see them as a unit, and then get surprised when they find `math.comb` without `math.perm`.

The good part is that now that we have math.comb, I think everything about the API of math.perm is already clear (including what to call it).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37128>
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