groupAwareChatEventHandlerFactory
fun groupAwareChatEventHandlerFactory(groupKey: String, clientState: ClientState): ChatEventHandlerFactory
Builds the group-aware ChatEventHandlerFactory used to drive grouped channel lists.
Marked as InternalStreamChatApi because the underlying handler/factory/resolver classes are deliberately hidden — the grouped-channels contract is still settling and we do not yet want to commit to a public extension point. Consumers should instantiate a grouped ChannelListViewModel instead of calling this directly.