TF-4383 Handle read only labels

labels/lib/model/label.dart

@@ -24,6 +24,7 @@ class Label with EquatableMixin {
   final String? displayName;
   final HexColor? color;
   final String? description;
+  final bool? readOnly;
 
   Label({
     this.id,
@@ -31,6 +32,7 @@ class Label with EquatableMixin {
     this.displayName,
     this.color,
     this.description,
+    this.readOnly,
   });
 
   factory Label.fromJson(Map<String, dynamic> json) => _$LabelFromJson(json);
@@ -44,5 +46,6 @@ class Label with EquatableMixin {
         displayName,
         color,
         description,
+        readOnly,
       ];
 }

labels/lib/model/labels_capability.dart

@@ -0,0 +1,23 @@
+import 'package:jmap_dart_client/jmap/core/capability/capability_properties.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'labels_capability.g.dart';
+
+@JsonSerializable(explicitToJson: true, includeIfNull: false)
+class LabelsCapability extends CapabilityProperties {
+  final int? version;
+
+  LabelsCapability({this.version});
+
+  factory LabelsCapability.fromJson(Map<String, dynamic> json) =>
+      _$LabelsCapabilityFromJson(json);
+
+  Map<String, dynamic> toJson() => _$LabelsCapabilityToJson(this);
+
+  static LabelsCapability deserialize(Map<String, dynamic> json) {
+    return LabelsCapability.fromJson(json);
+  }
+
+  @override
+  List<Object?> get props => [version];
+}