feat: add on_hover, pointer_over_ids, is_debug_mode, set_culling

[TheRedDeveloper]

• on_hover method that allows users to register Rust callbacks for hover events
• pointer_over_ids method to retrieve a Z-sorted list of all element IDs currently under the cursor
• is_debug_mode and set_culling methods

I'm making a lot of PRs, if you don't want to deal with merging individual features, you can go and pull my main branch.

git remote add reddev https://github.com/TheRedDeveloper/clayrs-fix.git
git fetch reddev
git merge reddev/main  # Make sure you are on master
git push