Support for evaluating floating point expressions

[Aljumaily]

It would be helpful to include support for the xfp package which contains the \fpeval{...} command. It has the ability to evaluate floating point expressions. For example, \fpeval{3*5^2 - cos(pi) * sqrt(64)} yields 83. A more involved request would be to support expl3 syntax but the xfp package suffice for now.

[dpvc]

I've marked as a feature request, though there are no immediate plans to implement it.