Add empty IOSurfaceRef type

Author: Kyle-Ye

Sources/OpenCoreGraphics/IOSurface.swift

@@ -0,0 +1,17 @@
+//
+//  IOSurface.swift
+//  OpenCoreGraphics
+//
+//  Created by Kyle on 1/17/26.
+
+public class IOSurfaceRef: Hashable {
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(ObjectIdentifier(self))
+    }
+
+    public static func == (lhs: IOSurfaceRef, rhs: IOSurfaceRef) -> Bool {
+        lhs === rhs
+    }
+}
+
+extension IOSurfaceRef: @unchecked Sendable {}