feat: Return value enforcer

[patidarmanoj10]

What?

• Introduces ReturnValueComparisonEnforcer, a new enforcer contract for the delegation framework.
• Allows enforcement of rules based on the return value of a staticcall to any contract.
• Supports flexible comparison operators: EQ, NEQ, GTE, LTE.
• Supports multiple value types: uint256, int256, uint128, int128, and bool.
• Compares values using ABI encoding for equality and decodes for ordered comparisons.

Why?

• Enables advanced delegation use cases where execution should be conditional on external contract state.
• Example: Only allow a repay action if the collateral ratio (queried from a protocol) is below a threshold.
• Increases security and flexibility for protocol integrations and automated account management.

How?

• _terms encodes the target contract, calldata, comparison operator, value type, and expected value.
• In beforeHook, the enforcer performs a staticcall to the target with the provided calldata.
• For EQ/NEQ, compares the keccak256 hash of the ABI-encoded return value and expected value (supports any type, including structs).
• For GTE/LTE, decodes the return and expected value to the specified type and performs the ordered comparison.
• Reverts with clear error messages if the comparison fails or if the type/operator is unsupported.