Implement max and min functions for primitive types that have them

[quentinmit]

f32, f64, etc. have functions called max and min that are defined to return the higher/lower non-NaN number. AFAICT it's not possible to actually call them on unit types without manually unpacking with either .value_raw or creating a dimensionless quantity and derefing. Please consider adding max and min functions on the unit types if the primitive type has them.

[v-morlock]

It would be great to also implement sin / cos / ... to make calculations with units easier. Right now, we have to do a lot of manual unpacking to do any meaningful calculations with units..