feat: Allowing fixed point math with arbitrary denominators

[FredCoen]

Right now wad_ray_math only offers math operations with denominators being WAD or RAY. This does not allow math between WAD and RAY but only WAD to WAD and RAY to RAY. It would be great to be able to specify a "denominator" (scale of the parameter you want to multiply or divide by) for more flexibility like it is done in this very popular solidity library https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol#L36

would it make sense to port this library here?

Thanks,
I'd be happy to do it!

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