Improve zoom experience

[kvg]

Right now when the user zooms in or out, the y-axis range just decreases or increases equally. It would be nicer to have the user's mouse pointer be the origin of the zoom transformation, such that whatever is under the cursor stays pretty much where it is, and the axis expands/shrinks around that point.

See the following references:

1. https://stackoverflow.com/questions/60190965/zoom-scale-at-mouse-position
2. https://farazzshaikh.medium.com/affine-transformations-pan-zoom-skew-96a3adf38eb2