Implement a visibility layer system

[adriengivry]

Problem this feature should fix

Currently, it's possible to include or exclude a material renderer from a render pass by toggling these checkboxes:

However, in some cases, we may want a specific material renderer to be included in one reflection probe but excluded from another.

Expected solution

We should implement a system that allows material renderers to select which layers they belong to (e.g., layers 0 to 31). These layers could be represented as a matrix of toggleable buttons. Directional lights (which render shadows), reflection probes, and cameras will each have a layer mask setting that determines which layers a renderer must be part of to be included in rendering.

[adriengivry]

Maybe we should make it so a renderer can only be part of one layer (selected somewhere at the top of the inspector):

And components that render things (directional lights, reflection probes, cameras) will be able to specify which layers they want to include