Rotation velocity and velocity dispersion additions

[VictorForouhar]

This PR will add rotation velocity calculations for subhalo aperture properties, as we may not want to use all bound stellar particles. Additionally, I will add luminosity-weighted averages for rotation velocities and velocity dispersions.

TODO:

• Mass-weighted rotation velocity calculation for aperture properties
• Mass-weighted cylindrical velocity dispersion calculation for aperture properties
• Luminosity-weighted implementation:
  • Define cylindrical velocities for each luminosity-weighted angular momentum vector (as they may differ across bands)
  • Luminosity-weighted rotational velocity.
  • Luminosity-weighted velocity dispersion tensor.

[VictorForouhar]

Managed to run the new functions successfully on an example from COLIBRE box, but it only has 15 stellar particles. I will test on a bigger box.

Also, I get negative rotation velocities for some of the bands, which is something I will also look into it.

[VictorForouhar]

The latest changes make consistent choices about velocity/position centering across angular momentum and cylindrical coordinate calculation (including mass-weighted).

After these changes, I no longer get a negative velocity for the example I was investigating (it went from a rotational velocity of -12km/s to 52km/s; quite a large change!)

[VictorForouhar]

I have been using this branch for L200m6 and L400m7 without crashes. Also for the L25 Mpc volumes across different resolutions.

[robjmcgibbon]

Thanks for catching the inconsistent reference positions and velocities. Can you please update the descriptions of the properties that changed? Then good to merge!