Optimize `drag` and `click` of `Pointer`

[cptbtptpbcptdtptp]

• [x] Script new callback about drag and drop
• [x] Pointer new API
• [x] Update pointer unit test

Summary by CodeRabbit

• New Features

  • Enhanced pointer interaction functionality with new handling for drag events (onPointerBeginDrag, onPointerEndDrag, and onPointerDrop).
  • Introduced a new property to capture raycasting results and restructured entity tracking for improved interaction.

• Bug Fixes

  • Improved accuracy and reliability of pointer event handling.

• Tests

  • Added comprehensive tests for new pointer event features and raycasting hit results to ensure functionality and performance.

• Refactor

  • Streamlined internal pointer event logic and entity tracking for better maintainability and performance.