Make ChatChannelScreen init public (#618)

Author: laevandus

Sources/StreamChatSwiftUI/ChatChannel/ChatChannelScreen.swift

@@ -6,12 +6,21 @@ import StreamChat
 import SwiftUI
 
 /// Screen component for the chat channel view.
-public struct ChatChannelScreen: View {
-    public var chatChannelController: ChatChannelController
+public struct ChatChannelScreen<Factory>: View where Factory: ViewFactory {
+    public let chatChannelController: ChatChannelController
+    private let viewFactory: Factory
 
+    public init(
+        chatChannelController: ChatChannelController,
+        viewFactory: Factory = DefaultViewFactory.shared
+    ) {
+        self.chatChannelController = chatChannelController
+        self.viewFactory = viewFactory
+    }
+    
     public var body: some View {
         ChatChannelView(
-            viewFactory: DefaultViewFactory.shared,
+            viewFactory: viewFactory,
             channelController: chatChannelController
         )
     }