Fix top bar for iOS

[igordmn]

Currently iOS samples use constant offset from the top to show the content.

Instead we should calculate top bar height (that is different for different devices) and use it as offset.

The calculation should be done automatically and embedded to androidx.compose.ui.window.Application.

We probably also need a new parameter - topBarColor in this function to automatically color the top bar.

Then all iOS samples should b fixed to remove current constant offset workaround.

[mipastgt]

Isn't that approach a little bit too simplistic? See for example: https://blog.felgo.com/cross-platform-app-development/notch-developer-guide-ios-android

[dima-avdeev-jb]

Useful links.
How it works on Android: /Users/dim/Desktop/github/dima-avdeev-jb/android-intets
Experiments on iOS: JetBrains/compose-multiplatform-core@36d9f9a

[dima-avdeev-jb]

Done in this PR:

• Expect insets in common compose-multiplatform-core#586

[okushnikov]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.