size examples in foundation-layout

Declare the preferred size of the content to be exactly sizedp square.

@Sampled
@Composable
fun SimpleSizeModifier() {
    Box { Box(Modifier.size(100.dp, 100.dp).background(Color.Red)) }
}

@Sampled
@Composable
fun SimpleSizeModifierWithDpSize() {
    Box { Box(Modifier.size(DpSize(100.dp, 100.dp)).background(Color.Red)) }
}