api [nfc]: Rename StreamDeleteEvent to ChannelDeleteEvent

Author: Khader-1

lib/api/model/events.dart

@@ -38,7 +38,7 @@ sealed class Event {
       case 'stream':
         switch (json['op'] as String) {
           case 'create': return ChannelCreateEvent.fromJson(json);
-          case 'delete': return StreamDeleteEvent.fromJson(json);
+          case 'delete': return ChannelDeleteEvent.fromJson(json);
           // TODO(#182): case 'update': …
           default: return UnexpectedEvent.fromJson(json);
         }
@@ -361,19 +361,19 @@ class ChannelCreateEvent extends ChannelEvent {
 
 /// A [ChannelEvent] with op `delete`: https://zulip.com/api/get-events#stream-delete
 @JsonSerializable(fieldRename: FieldRename.snake)
-class StreamDeleteEvent extends ChannelEvent {
+class ChannelDeleteEvent extends ChannelEvent {
   @override
   String get op => 'delete';
 
   final List<ZulipStream> streams;
 
-  StreamDeleteEvent({required super.id, required this.streams});
+  ChannelDeleteEvent({required super.id, required this.streams});
 
-  factory StreamDeleteEvent.fromJson(Map<String, dynamic> json) =>
-    _$StreamDeleteEventFromJson(json);
+  factory ChannelDeleteEvent.fromJson(Map<String, dynamic> json) =>
+    _$ChannelDeleteEventFromJson(json);
 
   @override
-  Map<String, dynamic> toJson() => _$StreamDeleteEventToJson(this);
+  Map<String, dynamic> toJson() => _$ChannelDeleteEventToJson(this);
 }
 
 // TODO(#182) StreamUpdateEvent, for a [ChannelEvent] with op `update`:

lib/api/model/events.g.dart

@@ -140,7 +140,7 @@ class ChannelStoreImpl with ChannelStore {
         // (Don't touch `subscriptions`. If the user is subscribed to the stream,
         // details will come in a later `subscription` event.)
 
-      case StreamDeleteEvent():
+      case ChannelDeleteEvent():
         for (final stream in event.streams) {
           assert(identical(streams[stream.streamId], streamsByName[stream.name]));
           assert(subscriptions[stream.streamId] == null