feat: Add error handling to Commit() function

[Apostlex0]

Description

This PR adds error handling to the Commit() function in the Verkle tree implementation. Previously, the Commit() function did not return errors, which could lead to silent failures.

Changes

• Modified the VerkleNode interface to make Commit() return (*Point, error)
• Updated all implementations of Commit() to properly handle and return errors
• Updated all callers of Commit() to handle the returned error
• Fixed test cases to properly handle errors from Commit()

Why

The original implementation did not handle potential errors during commitment computation, which could lead to:

1. Silent failures in critical operations
2. Inconsistent state when errors occur
3. Difficulty in debugging issues
4. Potential security implications

Testing

• All tests have been updated to handle errors from Commit() and they pass

Related Issues

• Improves error handling consistency across the codebase

[Apostlex0]

Hey, @gballet could you please review the pr and see if the changes are of any help.