feat: Implement logging for GraphQL API map

Log to application console all requests and all responses

lib/logic/api_maps/graphql_maps/api_map.dart

@@ -1,9 +1,48 @@
+// ignore_for_file: prefer_foreach
+
+import 'dart:async';
 import 'dart:io';
 
 import 'package:graphql_flutter/graphql_flutter.dart';
 import 'package:http/io_client.dart';
 import 'package:selfprivacy/config/get_it_config.dart';
 import 'package:selfprivacy/logic/api_maps/staging_options.dart';
+import 'package:selfprivacy/logic/models/message.dart';
+
+void _logToAppConsole<T>(final T objectToLog) {
+  getIt.get<ConsoleModel>().addMessage(
+        Message(
+          text: objectToLog.toString(),
+        ),
+      );
+}
+
+class LoggingLink extends Link {
+  @override
+  Stream<Response> request(
+    final Request request, [
+    final NextLink? forward,
+  ]) async* {
+    _logToAppConsole(request);
+    yield* forward!(request);
+  }
+}
+
+class LoggingResponseParser extends ResponseParser {
+  @override
+  Response parseResponse(final Map<String, dynamic> body) {
+    final response = super.parseResponse(body);
+    _logToAppConsole(response);
+    return response;
+  }
+
+  @override
+  GraphQLError parseError(final Map<String, dynamic> error) {
+    final graphQlError = super.parseError(error);
+    _logToAppConsole(graphQlError);
+    return graphQlError;
+  }
+}
 
 abstract class ApiMap {
   Future<GraphQLClient> getClient() async {
@@ -22,16 +61,23 @@ abstract class ApiMap {
     final httpLink = HttpLink(
       'https://api.$rootAddress/graphql',
       httpClient: ioClient,
+      parser: LoggingResponseParser(),
     );
 
     final String token = _getApiToken();
 
-    final Link graphQLLink = isWithToken
+    final Link graphQLLink = LoggingLink().concat(
-        ? AuthLink(
+      isWithToken
-            getToken: () async =>
+          ? AuthLink(
-                customToken == '' ? 'Bearer $token' : customToken,
+              getToken: () async =>
-          ).concat(httpLink)
+                  customToken == '' ? 'Bearer $token' : customToken,
-        : httpLink;
+            ).concat(httpLink)
+          : httpLink,
+    );
+
+    // Every request goes through either chain:
+    // 1. AuthLink -> HttpLink -> LoggingLink
+    // 2.             HttpLink -> LoggingLink
 
     return GraphQLClient(
       cache: GraphQLCache(),