Expose FillRatio component to configure DepthImage backprojection radius scaling

[Wumpf]

What

Introduces FillRatio component. Example:

rr.log("world/camera/depth", rr.DepthImage(depth_image, meter=10_000.0, backproject_radius_scale=0.2))

• Almost done with Replace EditableAutoProperties with a SpaceView component default system #5067
  • This was the last legacy property to blueprintify!
  • Only the actual cleanup is missing. Some of it already creeped in here since clippy noticed the cascade of unused things, but I went only as far as I had to to make it happy to keep this PR sane

Works as before:

Based on #6558 to avoid conflicts

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Deployed docs

Commit	Link
866457e	https://landing-adwkshask-rerun.vercel.app/docs