Log errors from PlatformDispatcher (#1257)

Co-authored-by: Manoel Aranda Neto <5731772+marandaneto@users.noreply.github.com>
Fixes #1255

Author: maBarabas

flutter/lib/src/integrations/on_error_integration.dart

@@ -41,6 +41,14 @@ class OnErrorIntegration implements Integration<SentryFlutterOptions> {
     _defaultOnError = wrapper.onError;
 
     _integrationOnError = (Object exception, StackTrace stackTrace) {
+      _options!.logger(
+        SentryLevel.error,
+        "Uncaught Platform Error",
+        logger: 'sentry.platformError',
+        exception: exception,
+        stackTrace: stackTrace,
+      );
+
       final handled = _defaultOnError?.call(exception, stackTrace) ?? true;
 
       // As per docs, the app might crash on some platforms