feat(mobile): add multi window support

[lucasfernog]

Leverages scenes on iOS and Activity embedding on Android.

iOS

• Added Event::SceneRequested (on iPad the user can request a new window to be open - e.g. by long pressing the app icon and selecting "New window")
• Request new scene to be created on Window::new (if needed, main scene is detected automatically) and assign the window instance later when it gets connected

Android

• Create new activity on Window::new (if needed, main activity is detected automatically)
• Added builder methods to determine the activity to be created
• System determines what to do with the activity (new stack, next to another one.. based on the embedding rules)

[github-actions]

Package Changes Through 989d9f7

There are 1 changes which include tao with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tao	0.34.5	0.35.0

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[lucasfernog]

needs tauri-apps/wry#1633