Fix line & points (& depth clouds points) radii being unaffected by scale & projection via Pinhole

[Wumpf]

What

Longstanding issue!

• Fixes Point & Line radii are unaffected by scale in affine transform #1223
• Fixes Point radius not correctly transformed during projection. #1219
• Fixes 2D point radius != None shows up inconsistently in 2D and 3D view #2494
• Replaces Properly scale radii for 2D parts shown in 3D space view's pinhole image plane #4196

Shader only fix, in the future the scale factor shouldn't be extracted on the fly for every vertex out of the transform and instead passed in, but I wanted to keep the change minimal. The added vertex shading cost is unlikely to matter all that much short term.
(also was very nice iterating on this and get before/after screenshots ;))

Throw-away test script for this:

import numpy as np
import rerun as rr

rr.init("scale fix test!!!", spawn=True)

#############################
# #2494 & #1219
#############################
rr.log("world/camera", rr.ViewCoordinates.RDF, timeless=True)
rr.log(
    "world/camera/image",
    rr.Pinhole(
        image_from_camera=np.array([[500, 0, 250], [0, 500, 250], [0, 0, 1]]),
        width=500,
        height=500,
    ),
)
rr.log("world/camera/image/rgb", rr.Image(np.ones((500, 500, 3))))
rr.log(
    "world/camera/image/points",
    rr.Points2D(np.random.uniform(0, 500, (30, 2)), radii=1),
)

#############################
# #1223
#############################
rr.log(
    "scaling_stuff/points_unscaled",
    rr.Points3D(
        np.random.uniform(0, 1, (30, 3)),
        radii=0.1,
    ),
)
rr.log(
    "scaling_stuff/points_scaled",
    rr.Points3D(
        np.random.uniform(0, 1, (30, 3)),
        radii=0.1,
    ),
    rr.Transform3D(scale=2.0, translation=[2, 2, 2]),
)


rr.log(
    "scaling_stuff/lines_unscaled",
    rr.LineStrips3D([[0, 1, 0], [0, 1, 1], [0, 0, 3]], radii=0.1),
)
rr.log(
    "scaling_stuff/lines_scaled",
    rr.LineStrips3D([[0, 1, 0], [0, 1, 1], [0, 0, 3]], radii=0.1),
    rr.Transform3D(scale=2.0, translation=[2, 2, 2]),
)

Result:

Before:

After:

This not only fixes issues with 2D->3D but also with 3D->2D.
Here we add the 3D points to the 2D camera and set a world space size for the points:

Before:

After:

Checklist

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• I've included a screenshot or gif (if applicable)
• I have tested demo.rerun.io (if applicable)
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