fixup! Add EntryWidget UI

This PR adds EntryWidget bottom sheet. In addition it adds the necessary
support files to be able to develop EntryWidget with SwiftUI.

MOB-3477

GliaWidgets/Sources/EntryWidget/EntryWidget.swift

@@ -55,7 +55,7 @@ private extension EntryWidget {
         let model = makeViewModel(
             channels: channels,
             selection: { channel in
-                // Logic for handling this callback will be handled later
+                // Logic for handling this callback will be handled later - MOB-3473
                 print(channel.headline)
             }
         )
@@ -86,7 +86,12 @@ private extension EntryWidget {
         let hostingController = UIHostingController(rootView: view)
 
         hostingController.view.backgroundColor = UIColor.white
-
+
+        // Due to the more modern sheet presenting approach being
+        // available starting from iOS 16, we need to handle cases
+        // where the visitor has either iOS 14 or 15 installed. For
+        // such visitors, we fall back on CustomPresentationController
+        //
         if #available(iOS 16.0, *) {
             guard let sheet = hostingController.sheetPresentationController else { return }
             let smallDetent: UISheetPresentationController.Detent = .custom { _ in