For #305 - Add support for Compose multiplatform

[Mugurell]

Add support for Compose Multiplatform - https://blog.jetbrains.com/kotlin/2023/05/compose-multiplatform-for-ios-is-in-alpha/

More details available in the individual commit's message. The gist of changes is that all the UI is now moved from :app to :shared and with the help of Compose Multiplatform both Android and iOS apps will share not just the same functionality but also the same UI.

For maintainers: I think this can be a separate branch in the project. I can ask merging in a new more suitable branch if one is created for this.

Android result	iOS result