fix: Add IGelatoOracleSwapFreezer

Author: miguelmtzinf

src/contracts/facilitators/gsm/swapFreezer/interfaces/IGelatoOracleSwapFreezer.sol

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+interface IGelatoOracleSwapFreezer {
+  function performUpkeep(bytes calldata) external;
+  function checkUpkeep(bytes calldata) external view returns (bool, bytes memory);
+}