feat: add commands for visual debugging (bounding boxes, etc.)

[skaldarnar]

Contains

This PR adds a couple of debug commands to toggle debug rendering features such as bounding boxes (entities, chunks) or skeletal meshes.

All commands are of the form debug:<settings-name> to introduce a common, consistent pattern and simplify correlation with the actual settings entry.

How to test

• debug:renderEntityBoundingBoxes entities such as sheep or deer (spawnPrefab deer in JS or MR) should be rendered with a white wireframe bounding box.
• debug:renderChunkBoundingBoxe chunk bounding boxes should be rendered in a black wireframe mode (can also be toggled via keyboard shortcut)
• debug:renderWireframe the whole world is rendered in wireframe mode (can also be toggled via keyboard shortcut)
• debug:renderSkeletons the skeleton (animation rig) of entites should be rendered as white outline. Easy to test alongside the bounding box rendering for entities

[pollend]

maybe we should just have all extra debugging driven this way. we use all our F keys for debug.