refactor: move _generate_default_id into BaseHandshake

[chimchim89]

This PR moves _generate_default_id into BaseHandshake as a static helper and removes unused commented code.
No functional changes.

[gemini-code-assist]

Summary of Changes

Hello @chimchim89, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on code refactoring within the BaseHandshake class. It relocates the _generate_default_id utility function, making it a static method of BaseHandshake to enhance code organization and maintainability. This change also includes the removal of previously commented-out, unused code, contributing to a cleaner codebase without introducing any functional alterations.

Highlights

• Code Organization: The _generate_default_id function has been moved from a global scope into the BaseHandshake class, improving encapsulation and logical grouping.
• Code Clean-up: Unused and commented-out code related to the _generate_default_id function has been removed, reducing clutter in the codebase.
• Dependency Management: The uuid module is now explicitly imported within src/chonkie/handshakes/base.py to support the relocated ID generation function.

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[gemini-code-assist]

Code Review

This pull request is a good refactoring that improves code organization by moving the _generate_default_id helper function into the BaseHandshake class. Removing the commented-out code is also a welcome cleanup. I have one minor suggestion to improve the signature of the new method for better clarity.

[gemini-code-assist]

The _generate_default_id method is defined to accept *args: Any, but these arguments are not used within the function. To improve clarity and accurately reflect that this function does not require any arguments, it's better to remove the unused *args from the signature. This makes the function's contract clearer to developers.

Suggested change

	def _generate_default_id(*args: Any) -> str:
	def _generate_default_id() -> str: