feat: Add DispatchOnce extension for DispatchQueue.

Sources/FoundationX/Extensions/DispatchOnce.swift

@@ -0,0 +1,29 @@
+//
+//  DispatchOnce.swift
+//  FoundationX
+// 
+//  Created by Guanghui Liang on 2024/2/25.
+//  Copyright © 2024 Guanghui Liang. All rights reserved.
+//
+
+import Foundation
+
+public extension DispatchQueue {
+
+    private static var _onceTracker = [String]()
+
+    /// Swift's DispatchOnce implementation. It's Thread safe.
+    /// - Parameters:
+    ///   - token: A unique string.
+    ///   - block: Block to execute once
+    class func once(token: String, block: () -> Void ) {
+        objc_sync_enter(self); defer { objc_sync_exit(self) }
+
+        if _onceTracker.contains(token) {
+            return
+        }
+
+        _onceTracker.append(token)
+        block()
+    }
+}