Add or modify interfaces of from_euler functions to support quantities

[vhirtham]

While refactoring the LCS tutorial I used the from_euler functions a lot. They currently require something like this:

WelDXClass.from_euler(sequence="x", angles=[1], degrees=False)

The combined parameters angles and degrees are basically just information that can be expressed by a quantity.
I think we should modify the interface to support pint.Quantity to be consistent with the rest of the code base and we can write something like this instead:

WelDXClass.from_euler(sequence="x", angles="1rad")

[CagtayFabry]

We could implement this using WXRotation (which we should do anyway instead of scipy) in .from_euler since WXRotation can already handle quantities as inputs by always converting to quantities like we do in the other classes.