refactor(remote_config): move params check logic out of the meethod channel

Author: lesnitsky

packages/firebase_remote_config/firebase_remote_config/lib/src/remote_config.dart

@@ -133,6 +133,16 @@ class RemoteConfig extends FirebasePluginPlatform with ChangeNotifier {
 
   /// Sets the default parameter values for the current instance.
   Future<void> setDefaults(Map<String, dynamic> defaultParameters) {
+    defaultParameters.values.forEach(_checkIsSupportedType);
     return _delegate.setDefaults(defaultParameters);
   }
+
+  void _checkIsSupportedType(dynamic value) {
+    if (value is! bool && value is! num && value is! String) {
+      throw Exception(
+        'Non-primitive types are not supported as config values. '
+        "If you're trying to pass a json object – convert it to string beforehand",
+      );
+    }
+  }
 }

packages/firebase_remote_config/firebase_remote_config_platform_interface/lib/src/method_channel/method_channel_firebase_remote_config.dart

@@ -222,8 +222,6 @@ class MethodChannelFirebaseRemoteConfig extends FirebaseRemoteConfigPlatform {
 
   @override
   Future<void> setDefaults(Map<String, dynamic> defaultParameters) async {
-    defaultParameters.values.forEach(_checkIsSupportedType);
-
     try {
       await channel.invokeMethod('RemoteConfig#setDefaults', <String, dynamic>{
         'appName': app.name,
@@ -287,13 +285,4 @@ class MethodChannelFirebaseRemoteConfig extends FirebaseRemoteConfigPlatform {
         return ValueSource.valueStatic;
     }
   }
-
-  void _checkIsSupportedType(dynamic value) {
-    if (value is! bool && value is! num && value is! String) {
-      throw Exception(
-        'Non-primitive types are not supported as config values. '
-        "If you're trying to pass a json object – convert it to string beforehand",
-      );
-    }
-  }
 }