Ability to use TabGroup without TabList

[gdanyaro]

It would be nice to have the possibility to use TabGroup without specifying the actual list of tabs so the control of active TabPanel will be entirely on the component consumer.

Vue example

<TabGroup :selected-index="selectedTab">
    <TabPanels>
        <TabPanel>Panel 1</TabPanel>
        <TabPanel>Panel 2</TabPanel>
    </TabPanels>
</TabGroup>