Support Density.textSize on iOS

[igordmn]

Code:

@Composable
fun MyText() {
    Text("Text", fontSize = 20.sp)
}

The size of the text should be relative to the font size settings in the iOS system.

As far, as I know, this setting is called "Dynamic type". We need to pass the value to ComposeScene(density = Density(textSize). 1.0 - no text scaling, 2.0 - double scaling

We also need to react on changes of this property.

[okushnikov]

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