feat engine add force close without message

Author: julian-ladjani

Source/SocketIO/Engine/SocketEngine.swift

@@ -335,6 +335,15 @@ open class SocketEngine: NSObject, WebSocketDelegate, URLSessionDelegate,
         }
     }
 
+    /// Force close engine.
+    ///
+    /// - parameter reason: The reason for the disconnection. This is communicated up to the client.
+    open func close(reason: String) {
+        guard connected && !closed else { return closeOutEngine(reason: reason) }
+        DefaultSocketLogger.Logger.log("Engine is being foce closed.", type: SocketEngine.logType)
+        closeOutEngine(reason: reason)
+    }
+
     private func _disconnect(reason: String) {
         guard connected && !closed else { return closeOutEngine(reason: reason) }
 

Source/SocketIO/Engine/SocketEngineSpec.swift

@@ -113,6 +113,11 @@ public protocol SocketEngineSpec: AnyObject {
     /// - parameter reason: The reason for the disconnection. This is communicated up to the client.
     func disconnect(reason: String)
 
+    /// Force close engine.
+    ///
+    /// - parameter reason: The reason for the disconnection. This is communicated up to the client.
+    func close(reason: String)
+
     /// Called to switch from HTTP long-polling to WebSockets. After calling this method the engine will be in
     /// WebSocket mode.
     ///