opt: add microphone permission tip

flutter/macos/Runner/MainFlutterWindow.swift

@@ -1,4 +1,5 @@
 import Cocoa
+import AVFoundation
 import FlutterMacOS
 import desktop_multi_window
 // import bitsdojo_window_macos
@@ -81,6 +82,23 @@ class MainFlutterWindow: NSWindow {
                 case "terminate":
                     NSApplication.shared.terminate(self)
                     result(nil)
+                case "canRecordAudio":
+                    switch AVCaptureDevice.authorizationStatus(for: .audio) {
+                    case .authorized:
+                        result(1)
+                        break
+                    case .notDetermined:
+                        result(0)
+                        break
+                    default:
+                        result(-1)
+                        break
+                    }
+                case "requestRecordAudio":
+                    AVCaptureDevice.requestAccess(for: .audio, completionHandler: { granted in
+                        result(granted)
+                    })
+                    break
                 default:
                     result(FlutterMethodNotImplemented)
                 }