AR Experience Enhancements: New Attributes, Anchors Mode & Native UI Integration

Enhanced Object Manipulation:
Added new attributes rotate, scale, and positionate to control whether objects can be rotated, scaled, and repositioned (via tap after initial placement).

Look-At User Feature:
Introduced the lookatuser attribute for GPS and anchors modes, ensuring objects automatically face the user for an improved interactive experience.

Altitude Control:
Added the altitude attribute for GPS and anchors modes, enabling precise adjustments to the object's height in the AR environment.

Anchors Mode:
Implemented a new anchors mode using WebXR Anchors, providing more stable and accurate object placement.

Native UI Integration:
Transitioned to using the WebXR API's dom-overlay feature for rendering UI, replacing the previous Three.js-based approach for a more seamless integration.