Add getTitleWidget to RadarChart to return a Widget for title.

[bridgein]

Right Now, The RadarChart can only set simple text for title,
Is it possible also add getTitleWidget to RadarChart so we can customize the title such as show a rich text or icon etc?

[liranzairi]

Joining the request. In my case I want to make the titles tappable and in the current implementation they're not.