feat: Call Interval Enforcer

[patidarmanoj10]

What?

• Add CallIntervalEnforcer contract to enforce a minimum interval between consecutive calls for a given delegation.
• Includes unit tests for interval enforcement logic.

Why?

• To provide a reusable enforcer that restricts the frequency of delegation usage, improving security and flexibility for delegation-based systems.
• Enables use cases such as rate-limiting actions or enforcing cooldown periods on delegated permissions.

How?

• Implements a beforeHook that checks if the required interval has passed since the last call for a (delegationManager, delegationHash) pair.
• Stores the last execution timestamp in a mapping.
• Decodes the interval from _terms (32 bytes, uint256 seconds).
• Adds comprehensive unit tests to verify correct enforcement, including edge cases and independent tracking for different managers and delegations.