TF-1204 Add firebase object and capability

fcm/lib/converter/device_client_id_nullable_converter.dart

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+import 'package:fcm/model/device_client_id.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+class DeviceClientIdNullableConverter implements JsonConverter<DeviceClientId?, String?> {
+  const DeviceClientIdNullableConverter();
+
+  @override
+  DeviceClientId? fromJson(String? json) => json != null ? DeviceClientId(json) : null;
+
+  @override
+  String? toJson(DeviceClientId? object) => object?.value;
+}

fcm/lib/converter/firebase_expired_time_nullable_converter.dart

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+import 'package:fcm/model/firebase_expired_time.dart';
+import 'package:jmap_dart_client/http/converter/utc_date_converter.dart';
+import 'package:jmap_dart_client/http/converter/utc_date_nullable_converter.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+class FirebaseExpiredTimeNullableConverter implements JsonConverter<FirebaseExpiredTime?, String?> {
+  const FirebaseExpiredTimeNullableConverter();
+
+  @override
+  FirebaseExpiredTime? fromJson(String? json) {
+    if (json != null) {
+      return FirebaseExpiredTime(const UTCDateConverter().fromJson(json));
+    } else {
+      return null;
+    }
+  }
+
+  @override
+  String? toJson(FirebaseExpiredTime? object) => const UTCDateNullableConverter().toJson(object?.value);
+}

fcm/lib/converter/firebase_registration_id_nullable_converter.dart

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+import 'package:fcm/model/firebase_registration_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+class FirebaseRegistrationIdNullableConverter implements JsonConverter<FirebaseRegistrationId?, String?> {
+  const FirebaseRegistrationIdNullableConverter();
+
+  @override
+  FirebaseRegistrationId? fromJson(String? json) => json != null ? FirebaseRegistrationId(Id(json)) : null;
+
+  @override
+  String? toJson(FirebaseRegistrationId? object) => object?.id.value;
+}

fcm/lib/converter/firebase_token_nullable_converter.dart

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+import 'package:fcm/model/firebase_token.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+class FirebaseTokenNullableConverter implements JsonConverter<FirebaseToken?, String?> {
+  const FirebaseTokenNullableConverter();
+
+  @override
+  FirebaseToken? fromJson(String? json) => json != null ? FirebaseToken(json) : null;
+
+  @override
+  String? toJson(FirebaseToken? object) => object?.value;
+}

fcm/lib/converter/type_name_converter.dart

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+import 'package:fcm/model/type_name.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+class TypeNameConverter implements JsonConverter<TypeName, String> {
+  const TypeNameConverter();
+
+  @override
+  TypeName fromJson(String json) => TypeName(json);
+
+  @override
+  String toJson(TypeName object) => object.value;
+}