add some method

ios/Classes/Util/Any+Extension.swift

@@ -0,0 +1,23 @@
+//
+//  Any+Extension.swift
+//  flutter_openim_sdk
+//
+//  Created by willem on 2021/10/9.
+//
+
+import Foundation
+
+public func typeName(_ obj: Any) -> String {
+    if obj is AnyClass {
+        return "\(obj)"
+    }
+    return "\(type(of: obj))"
+}
+
+public func safeMainAsync(_ work: @escaping @convention(block) () -> Void) {
+    if Thread.isMainThread {
+        work()
+    } else {
+        DispatchQueue.main.async(execute: work)
+    }
+}