Add ERC165 and Multicall interfaces locally

Author: Krishang Nadgauda

contracts/eip/interface/IERC165.sol

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @dev Interface of the ERC165 standard, as defined in the
+ * https://eips.ethereum.org/EIPS/eip-165[EIP].
+ *
+ * Implementers can declare support of contract interfaces, which can then be
+ * queried by others ({ERC165Checker}).
+ *
+ * For an implementation, see {ERC165}.
+ */
+interface IERC165 {
+    /**
+     * @dev Returns true if this contract implements the interface defined by
+     * `interfaceId`. See the corresponding
+     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
+     * to learn more about how these ids are created.
+     *
+     * This function call must use less than 30 000 gas.
+     */
+    function supportsInterface(bytes4 interfaceId) external view returns (bool);
+}

contracts/feature/interface/IMulticall.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v4.5.0) (utils/Multicall.sol)
+
+pragma solidity ^0.8.0;
+
+/**
+ * @dev Provides a function to batch together multiple calls in a single external call.
+ *
+ * _Available since v4.1._
+ */
+interface IMulticall {
+    /**
+     * @dev Receives and executes a batch of function calls on this contract.
+     */
+    function multicall(bytes[] calldata data) external returns (bytes[] memory results);
+}