Add the sponsor screen on iOS

[enthuan]

The sponsors are displayed in the about section on iOS.

It's a good candidate to experiment Compose Multiplatform.

• Copy the current Android sponsor screen in the UI module using compose Multiplatform imports
• Try to implement its view model
• Create a SwiftUI view that use it and plug it on a new entry in the tabbar
• The screen will be ready when we will drop Compose native for MP on Android.

[enthuan]

✅ Copy the current Android sponsor screen in the UI module using compose Multiplatform imports ✅ Create a SwiftUI view that use it and plug it on a new entry in the tabbar