TimelockGuard add basic configuration functionality

packages/contracts-bedrock/interfaces/safe/ITimelockGuard.sol

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import { Enum } from "safe-contracts/common/Enum.sol";
+import { ISemver } from "interfaces/universal/ISemver.sol";
+import { Guard as IGuard } from "safe-contracts/base/GuardManager.sol";
+
+
+/// @title ITimelockGuard
+/// @notice Interface for the TimelockGuard Safe guard.
+interface ITimelockGuard is IGuard, ISemver {
+    // Errors
+    error TimelockGuard_GuardNotConfigured();
+    error TimelockGuard_GuardNotEnabled();
+    error TimelockGuard_GuardStillEnabled();
+    error TimelockGuard_InvalidTimelockDelay();
+
+    // Events
+    event GuardCleared(address indexed safe);
+    event GuardConfigured(address indexed safe, uint256 timelockDelay);
+
+    // Views
+    function version() external view returns (string memory);
+
+    function viewTimelockGuardConfiguration(address _safe) external view returns (uint256);
+
+    function cancellationThreshold(address _safe) external view returns (uint256 cancellationThreshold_);
+
+    function safeCancellationThreshold(address) external view returns (uint256);
+
+    function safeConfigs(address)
+        external
+        view
+        returns (uint256 timelockDelay);
+
+    // Admin
+    function configureTimelockGuard(uint256 _timelockDelay) external;
+
+    function clearTimelockGuard() external;
+
+    // Scheduling API (placeholders until fully implemented in the guard)
+    function scheduleTransaction(
+        address _safe,
+        address _to,
+        uint256 _value,
+        bytes memory _data,
+        Enum.Operation _operation,
+        uint256 _safeTxGas,
+        uint256 _baseGas,
+        uint256 _gasPrice,
+        address _gasToken,
+        address payable _refundReceiver,
+        bytes memory _signatures
+    )
+        external
+        pure;
+
+    function checkPendingTransactions(address _safe) external pure returns (bytes32[] memory pendingTxs_);
+
+    function rejectTransaction(address _safe, bytes32 _txHash) external pure;
+
+    function rejectTransactionWithSignature(address _safe, bytes32 _txHash, bytes memory _signatures) external pure;
+
+    function cancelTransaction(address _safe, bytes32 _txHash) external pure;
+}
+