Add cubic root function

[Chaosus]

I think this function is a useful addition. Previously, user may use: pow(number, 1.0 / 3.0) - compared to it, according to C++ documentation (https://en.cppreference.com/w/cpp/numeric/math/cbrt) this function should work faster and more precise.

[Ivorforce]

Is there a proposal for this function?
cbrt being faster is probably not relevant for the bindings, since the bottleneck is probably GDScript / the binding layers rather than the calculation itself.
I can see it being useful for its improved preciseness, but that depends on whether users are actually using cubic roots sometimes?

[AThousandShips]

Considering we only use it exactly twice in the whole codebase I think is indicative of that we should gauge if the community actually needs this and the precision difference (the actual difference is almost completely negligible, probably within one or two epsilon, note also that unlike std::sqrt, std::cbrt is not guaranteed to be exact), so the main value would be that std::cbrt handles negative values unlike std::pow, but that's trivial to work around though you'd need a little guard code

[Mickeon]

Mmm. I'd say exposing this function would be quite hasty, especially without any corresponding proposal.
If there other cases in the codebase where it would be used, then it makes sense to keep it in Math, otherwise I don't know...

[AThousandShips]

I did a search and there are no cases where cbrt can be dropped in directly, i.e. no cases with a constant pow(x, 1 / 3.0)

[Mickeon]

Yyyeah, it's too niche. I would personally move this function to editor_audio_buses.cpp, where it's used, and give it a longer name for clearness.

[AThousandShips]

One method I'd say we should consider adding is log10, it's used in 14 places and has a lot of relevant uses, but it's also trivial to work around, but it does have more of a regular use case