Customize Thumb component

[s43]

Describe the Feature

Currently the thumb component only allows us to use Image source props.
It would be useful if we had a prop that takes a custom component as there's plenty of use cases and problems to solve with this approach for example :

• Videos thumbnails on slide
• TVOS focus related issues ( it's impossible to maintain the focus without having access to the thumb component )

Possible Implementations

an optional thumbComponent props that accepts a functional component

[BartoszKlonowski]

Hello @s43!
Let me close this issue as a duplicate of #154.
Please track the progress there.