Extend TabStrip API to support custom behaviours

[fscarponi]

In the IDE and in some specs, you can find some kind of fanciful Tabs usage...

as an example, using a composite tabHeader content that has a title made by two different texts with different styles or icons

we can change the api for to allow users to provide content for tabs, allowing users to solve their own problems

migrating to a new DSL:

    public class TabData.Editor(
        override val selected: Boolean,
        override val content: @Composable TabContentScope.(tabState: TabState) -> Unit,
        override val closable: Boolean = true,
        override val onClose: () -> Unit = {},
        override val onClick: () -> Unit = {},
    ) : TabData()

and exposing the following methods:

@Composable
public fun TabContentScope.SimpleTabContent(
    title: String,
    state: TabState,
    icon: Painter?,
    modifier: Modifier = Modifier,
) 

@Composable
public fun TabContentScope.SimpleTabContent(
    modifier: Modifier = Modifier,
    state: TabState,
    icon: (@Composable () -> Unit)? = null,
    label: @Composable () -> Unit,
)

this will allow achieving custom behavior for the tab, as we show in the standalone sample