feat(beta): support class methods and instance methods for tool helpers

[Ashutosh0x]

Fixes #1087. Adds comprehensive support for class methods, instance methods, and static methods when using @beta_tool decorators.

Key changes:

• Implemented the descriptor protocol (get) on tool classes to handle automatic binding.
• Updated JSON schema generation to exclude 'self' and 'cls' parameters.
• Updated decorators to correctly unwrap and re-wrap classmethod/staticmethod objects.
• Changed tool objects to be directly callable (removing @Property on call) to fix method binding issues.