Added option to add reactions to talk messages

lib/api/marianumcloud/talk/reactMessage/reactMessage.dart

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+import 'package:http/http.dart' as http;
+import 'package:http/http.dart';
+
+import '../../../apiParams.dart';
+import '../talkApi.dart';
+import 'reactMessageParams.dart';
+
+class ReactMessage extends TalkApi {
+  String chatToken;
+  int messageId;
+  ReactMessage({required this.chatToken, required this.messageId, required ReactMessageParams params}) : super("v1/reaction/$chatToken/$messageId", params);
+
+  @override
+  assemble(String raw) {
+
+  }
+
+  @override
+  Future<Response>? request(Uri uri, ApiParams? body, Map<String, String>? headers) {
+    if(body is ReactMessageParams) {
+      return http.post(uri, headers: headers, body: body.toJson());
+    }
+    return null;
+  }
+
+}

lib/api/marianumcloud/talk/reactMessage/reactMessageParams.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+import '../../../apiParams.dart';
+
+part 'reactMessageParams.g.dart';
+
+@JsonSerializable()
+class ReactMessageParams extends ApiParams {
+  String reaction;
+
+  ReactMessageParams(this.reaction);
+
+  factory ReactMessageParams.fromJson(Map<String, dynamic> json) => _$ReactMessageParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$ReactMessageParamsToJson(this);
+}

lib/api/marianumcloud/talk/reactMessage/reactMessageParams.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'reactMessageParams.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+ReactMessageParams _$ReactMessageParamsFromJson(Map<String, dynamic> json) =>
+    ReactMessageParams(
+      json['reaction'] as String,
+    );
+
+Map<String, dynamic> _$ReactMessageParamsToJson(ReactMessageParams instance) =>
+    <String, dynamic>{
+      'reaction': instance.reaction,
+    };