Improve the orbit eye to always maintain an up-axis

[emilk]

• Continuing the work in Orbit eye: bugfixes and usability improvements #3817

What

• The orbit eye now always maintains an up axis internally (+Z by default, if there is no ViewCoordinates).
• When a user rolls the camera (middle mouse drag), we now change the internal up-axis, which makes rolling then orbiting a much better experience as you don't end up in a weird state with no up axis.
• The orbit eye center visualization now indicates the current up-axis

orbit-camera-up-axis.mp4

• Fixes Orbital camera should always maintain an up axis internally #3539
• Fixes World up-axis not respected under various conditions #3420

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested the web demo (if applicable):
  • Using newly built examples: app.rerun.io
  • Using examples from latest main build: app.rerun.io
  • Using full set of examples from nightly build: app.rerun.io
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG
• If applicable, add a new check to the release checklist!

• PR Build Summary
• Docs preview
• Examples preview
• Recent benchmark results
• Wasm size tracking

[teh-cmc]

Feels pretty great!

It can be very hard to see the up-axis on the orbit eye center visualization depending on the angle, not sure what we can do about this... Actually, come to think of it, it's hard to see any axis on that visualization: could it be a gizmo-like thing similar to what we do for transforms? (Then again all things ViewCoordinates really confuse me so maybe that doesn't make any sense.)

There is a lurking bug in tilted mode where the camera will just stop behaving appropriately (you can do full orbits, controls start to do random-looking things, etc).
I have no other repro steps than "play around with the middle-mouse button":

24-02-15_09.27.38.patched.mp4

I don't think that's blocking, it's hard to trigger and easy to get out of (just double click).