refactor(🌱): minor enhancements

[walidkorchi]

This PR introduces features, fixes, and many changes which can be found below
Everything described here is subject to change ⚠️

Features

• tsup: code splitting (multiple index.ts entry points) to load JS in production when needed
• RoomPreview.ts: preview floor + interactions to add/remove tiles and their height
• HMR: Vite HMR's API prevents reloading the entire page whenever changes are made, the room is destroyed instead and re-rendered for a fast dev environment.

Fixes

• GreedyMesher.ts: Stairs are merged where they shouldn't be
• RoomHeightMap.ts: improve conditional stairs logic
• Sorting.ts: just fix everything
• Camera
  • RoomCamera.ts: unbind listeners when the room is destroyed
  • pre-zooming when zoom.level changes
  • Fix issues with devicePixelRatio, zoom and drag

Refactors

• Move pixi-stats & pixi-devtools outside the package
  (they shouldn't be bundled with the final package, thus reduce the bundle size)
• Stairs:
  • hitarea not allowing clicks on stairs
  • Floating cube faces around stairs + new stair type

Changelog

• Add configurable camera movement speed

[Pi-Bouf]

I love this work ! ❤️