Add clip

[jl-wynen]

Add sc.clip corresponding to np.clip https://numpy.org/doc/stable/reference/generated/numpy.clip.html
Alternatively, it can be called clamp (https://en.cppreference.com/w/cpp/algorithm/clamp) which I think is more common in graphics programming.

Currently, we need to either use numpy or workaround it like this

var = sc.where(var < lo, lo, var)
var = sc.where(var > hi, hi, var)

I encountered this for the second time now when setting fit windows and making sure they are within the range of the data.