Proof of concept for reference spaces, implements ideas from #772

I think I want to rename it to reference frame since that's what physicist and math people are used to, I wanted to avoid confusion with the Frame class which is something else completely but Frame is something a user would never touch so.

There are two sine waves here but the red one is 3 orders or magnitude larger. The magenta y-axis indicates the values for the red sine data which ranges from [-1000, 1000] and the white axis ticks are for the white sine line which ranges from [-1, 1]

By removing the camera from a reference space's controller we can also interactively independently rescale a given reference frame! Will need quite some work to do this properly, have methods to re-sync positions or other things between reference frames etc.

import numpy as np
import fastplotlib as fpl


xs = np.linspace(0, 10 * np.pi, 1000)
ys = np.sin(xs)

ys100 = ys * 1000

l1 = np.column_stack([xs, ys])
l2 = np.column_stack([xs, ys100])

fig = fpl.Figure(size=(500, 400))

fig[0, 0].add_line(l1)
fig.show(maintain_aspect=False)
fig[0, 0].auto_scale(zoom=0.4)

rs = fig[0, 0].add_reference_space(scale=(1, 500, 1))
l2 = fig[0, 0].add_line(l2, reference_space=rs, colors="r")
l2.add_axes(rs)
l2.axes.y.line.material.color = "m"

fpl.loop.run()