Added reaction overview with list of names who reacted

lib/api/marianumcloud/talk/getReactions/getReactionsResponse.dart

@@ -0,0 +1,31 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'getReactionsResponse.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class GetReactionsResponse {
+  Map<String, List<GetReactionsResponseObject>> data;
+
+  GetReactionsResponse(this.data);
+
+  factory GetReactionsResponse.fromJson(Map<String, dynamic> json) => _$GetReactionsResponseFromJson(json);
+  Map<String, dynamic> toJson() => _$GetReactionsResponseToJson(this);
+}
+
+@JsonSerializable()
+class GetReactionsResponseObject {
+  GetReactionsResponseObjectActorType actorType;
+  String actorId;
+  String actorDisplayName;
+  int timestamp;
+
+  GetReactionsResponseObject(this.actorType, this.actorId, this.actorDisplayName, this.timestamp);
+
+  factory GetReactionsResponseObject.fromJson(Map<String, dynamic> json) => _$GetReactionsResponseObjectFromJson(json);
+  Map<String, dynamic> toJson() => _$GetReactionsResponseObjectToJson(this);
+}
+
+enum GetReactionsResponseObjectActorType {
+  @JsonValue("guests") guests,
+  @JsonValue("users") users,
+}