feat: Added updatePartial endpoint

packages/stream_chat/lib/src/api/channel.dart

@@ -394,6 +394,13 @@ class Channel {
     return _client.decode(response.data, UpdateChannelResponse.fromJson);
   }
 
+  /// Edit the channel custom data
+  Future<PartialUpdateChannelResponse> updatePartial(
+      Map<String, dynamic> channelData) async {
+    final response = await _client.patch(_channelURL, data: channelData);
+    return _client.decode(response.data, PartialUpdateChannelResponse.fromJson);
+  }
+
   /// Delete this channel. Messages are permanently removed.
   Future<EmptyResponse> delete() async {
     final response = await _client.delete(_channelURL);

packages/stream_chat/lib/src/api/responses.dart

@@ -247,6 +247,20 @@ class UpdateChannelResponse extends _BaseResponse {
       _$UpdateChannelResponseFromJson(json);
 }
 
+/// Model response for [Channel.updatePartial] api call
+@JsonSerializable(createToJson: false)
+class PartialUpdateChannelResponse extends _BaseResponse {
+  /// Updated channel
+  ChannelModel channel;
+
+  /// Channel members
+  List<Member> members;
+
+  /// Create a new instance from a json
+  static PartialUpdateChannelResponse fromJson(Map<String, dynamic> json) =>
+      _$PartialUpdateChannelResponseFromJson(json);
+}
+
 /// Model response for [Channel.inviteMembers] api call
 @JsonSerializable(createToJson: false)
 class InviteMembersResponse extends _BaseResponse {

packages/stream_chat/lib/src/api/responses.g.dart

@@ -225,6 +225,23 @@ UpdateChannelResponse _$UpdateChannelResponseFromJson(Map json) {
           ));
 }
 
+PartialUpdateChannelResponse _$PartialUpdateChannelResponseFromJson(Map json) {
+  return PartialUpdateChannelResponse()
+    ..duration = json['duration'] as String
+    ..channel = json['channel'] == null
+        ? null
+        : ChannelModel.fromJson((json['channel'] as Map)?.map(
+            (k, e) => MapEntry(k as String, e),
+          ))
+    ..members = (json['members'] as List)
+        ?.map((e) => e == null
+            ? null
+            : Member.fromJson((e as Map)?.map(
+                (k, e) => MapEntry(k as String, e),
+              )))
+        ?.toList();
+}
+
 InviteMembersResponse _$InviteMembersResponseFromJson(Map json) {
   return InviteMembersResponse()
     ..duration = json['duration'] as String