forward barcode error events as FlutterError()'s on iOS & MacOS

@@ -19,6 +19,12 @@ public class BarcodeHandler: NSObject, FlutterStreamHandler {
         eventChannel.setStreamHandler(self)
     }
     
+    func publishError(_ error: FlutterError) {
+        DispatchQueue.main.async {
+            self.eventSink?(error)
+        }
+    }
+    
     func publishEvent(_ event: [String: Any?]) {
         DispatchQueue.main.async {
             self.eventSink?(event)

@@ -42,10 +42,10 @@ public class MobileScannerPlugin: NSObject, FlutterPlugin {
     init(barcodeHandler: BarcodeHandler, registry: FlutterTextureRegistry) {
         self.mobileScanner = MobileScanner(registry: registry, mobileScannerCallback: { barcodes, error, image in
             if error != nil {
-                barcodeHandler.publishEvent([
-                    "name": MobileScannerErrorCodes.BARCODE_ERROR,
-                    "data": error!.localizedDescription,
-                ])                
+                barcodeHandler.publishError(
+                    FlutterError(code: MobileScannerErrorCodes.BARCODE_ERROR,
+                                 message: error?.localizedDescription,
+                                 details: nil))
                 return
             }
             

@@ -131,10 +131,9 @@ public class MobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHandler,
                         
                         if error != nil {
                             DispatchQueue.main.async {
-                                self?.sink?([
-                                    "name": MobileScannerErrorCodes.BARCODE_ERROR,
-                                    "data": error?.localizedDescription,
-                                ])
+                                self?.sink?(FlutterError(
+                                    code: MobileScannerErrorCodes.BARCODE_ERROR,
+                                    message: error?.localizedDescription, details: nil))
                             }
                             return
                         }
@@ -185,10 +184,9 @@ public class MobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHandler,
                     try imageRequestHandler.perform([barcodeRequest])
                 } catch let error {
                     DispatchQueue.main.async {
-                        self?.sink?([
-                            "name": MobileScannerErrorCodes.BARCODE_ERROR,
-                            "data": error.localizedDescription,
-                        ])
+                        self?.sink?(FlutterError(
+                            code: MobileScannerErrorCodes.BARCODE_ERROR,
+                            message: error.localizedDescription, details: nil))
                     }
                 }
             }