add clear for Bytes32x2Set

contracts/utils/structs/EnumerableSet.sol

@@ -488,6 +488,24 @@ library EnumerableSet {
         }
     }
 
+    /**
+     * @dev Removes all the values from a set. O(n).
+     *
+     * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+     * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+     */
+    function clear(Bytes32x2Set storage self) internal {
+        bytes32[2][] storage v = self._values;
+
+        uint256 len = length(self);
+        for (uint256 i = 0; i < len; ++i) {
+            delete self._positions[_hash(v[i])];
+        }
+        assembly ("memory-safe") {
+            sstore(v.slot, 0)
+        }
+    }
+
     /**
      * @dev Returns true if the value is in the self. O(1).
      */

scripts/generate/templates/EnumerableSet.js

@@ -329,6 +329,24 @@ function remove(${name} storage self, ${type} memory value) internal returns (bo
     }
 }
 
+/**
+ * @dev Removes all the values from a set. O(n).
+ *
+ * WARNING: Developers should keep in mind that this function has an unbounded cost and using it may render the
+ * function uncallable if the set grows to the point where clearing it consumes too much gas to fit in a block.
+ */
+function clear(${name} storage self) internal {
+    ${type}[] storage v = self._values;
+
+    uint256 len = length(self);
+    for (uint256 i = 0; i < len; ++i) {
+        delete self._positions[_hash(v[i])];
+    }
+    assembly ("memory-safe") {
+        sstore(v.slot, 0)
+    }
+}
+
 /**
  * @dev Returns true if the value is in the self. O(1).
  */