[issue35606] Add prod() function to the math module

[Rémi Lapeyre]

Rémi Lapeyre <remi.lapeyre at henki.fr> added the comment:

@serhiy.storchaka, it should be possible to make it far simpler if we make math_prod_impl more naive by removing the hypothesis made on `iterable` and the many fast-paths like builtin_sum_impl() does when SLOW_SUM is defined, right?

A naive implementation would also support user-defined types which would probably be a good thing IMO

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nosy: +remi.lapeyre

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