change defaults to support voice isolation

ios/Classes/SwiftLiveKitPlugin.swift

@@ -79,15 +79,39 @@ public class SwiftLiveKitPlugin: NSObject, FlutterPlugin {
             print("[LiveKit] Configuring mode: ", configuration.mode)
         }
 
-        let session = RTCAudioSession.sharedInstance()
-        session.lockForConfiguration()
+        // get `RTCAudioSession` and lock
+        let rtcSession = RTCAudioSession.sharedInstance()
+        rtcSession.lockForConfiguration()
+
+        var isLocked: Bool = true
+        let unlock = {
+            guard isLocked else {
+                print("[LiveKit] not locked, ignoring unlock")
+                return
+            }
+            rtcSession.unlockForConfiguration()
+            isLocked = false
+        }
+
+        // always `unlock()` when exiting scope, calling multiple times has no side-effect
         defer {
-            session.unlockForConfiguration()
+            unlock()
         }
 
         do {
-            try session.setConfiguration(configuration, active: true)
-            print("[LiveKit] Configure success")
+            try rtcSession.setConfiguration(configuration, active: true)
+            // unlock here before configuring `AVAudioSession`
+            // unlock()
+            print("[LiveKit] RTCAudioSession Configure success")
+
+            // also configure longFormAudio
+            // let avSession = AVAudioSession.sharedInstance()
+            // try avSession.setCategory(AVAudioSession.Category(rawValue: configuration.category),
+            //                      mode: AVAudioSession.Mode(rawValue: configuration.mode),
+            //                      policy: .default,
+            //                      options: configuration.categoryOptions)
+            // print("[LiveKit] AVAudioSession Configure success")
+
             result(true)
         } catch let error {
             print("[LiveKit] Configure audio error: ", error)