Replace `hitbox_type` in `move` and `raycast` with a callback

[aksiome]

🗂️ Request Type

Feature

🧩 Feature or Module Name

bs.hitbox, bs.move, bs.raycast

📝 Description

Refactor move and raycast to accept a custom callback that returns a shape hitbox based on the block being processed. This would replace the current hitbox_type parameter and offer more flexibility.

We can provide a set of built-in callbacks (e.g. in the hitbox module), including variants that correctly handle fluids and waterlogged blocks.
This change will:

• Make the system more modular and extensible
• Improve support for edge cases like partial or waterlogged blocks (and fix Add hitbox shapes for intangible blocks #462)
• Allow users to define custom hitbox behavior as needed