Scene graph

## What problem does this solve or what need does it fill?

Fast query of objects in vicinity of a given point

## What solution would you like?

Octree, quadtree ...

## What alternative(s) have you considered?

None

## Additional context

I am evaluating bevy for future development that requires performant graphics using wgpu on the web.
An important part of that is proper culling and scene queries to determine visibility and proximity.
Libraries like threejs does not come out the box with such things.
I would like to understand the vision around this for bevy, please.