Axes scaling keywords in `Axis3` (ex. `xscale = log10`)

[jonathanfischer97]

Add xscale, yscale, zscale keywords to Axis3

Would like to be able to scale the x,y, and z axes of an Axis3 object using a scale kwarg, similar to the behavior with Axis.

• An example would be Axis3(xscale = log10, yscale = log10, scale = log10), for setting the axis of a 3D plot where all 3 dimensions are log scaled.