Fix CameraProjection panic and improve CameraProjectionPlugin

[doonv]

Objective

Fix #11799 and improve CameraProjectionPlugin

Solution

CameraProjectionPlugin is now an all-in-one plugin for adding a custom CameraProjection. I also added PbrProjectionPlugin which is like CameraProjectionPlugin but for PBR.

P.S. I'd like to get this merged after #11766.

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Changelog

• Changed CameraProjectionPlugin to be an all-in-one plugin for adding a CameraProjection
• Removed VisibilitySystems::{UpdateOrthographicFrusta, UpdatePerspectiveFrusta, UpdateProjectionFrusta}, now replaced with VisibilitySystems::UpdateFrusta
• Added PbrProjectionPlugin for projection-specific PBR functionality.

Migration Guide

VisibilitySystems's UpdateOrthographicFrusta, UpdatePerspectiveFrusta, and UpdateProjectionFrusta variants were removed, they were replaced with VisibilitySystems::UpdateFrusta

[doonv]

This is now unblocked since #11766 has been merged.

[NthTensor]

Code looks like a big improvement. Will approve later after I get the chance to evaluate this on examples.

[Zoomulator]

@doonv I did a rebase and fixed conflicts: doonv#3

Notable conflicts:

• CameraProjectionPlugin<T> got new trait bounds T: CameraProjection + Component + GetTypeRegistration, which conflicted with a doc comment above it.
• CameraUpdateSystem struct definition was moved to the line below CameraProjectionPlugin
• check_visibility is now generic check_visibility::<WithMesh> (view/visibility/mod.rs)

[Zoomulator]

Been running this in my own bevy fork for my game and it's been working well with my custom projection + pbr shadows. No complaints :)

[Zoomulator]

Looks good! Well spotted to not need the check_visibility.after given the recently added .before(CheckVisibility) above.