Expose the style prop accepted by the Pager component

[simonbuerger]

Pager component already has a style prop, this just exposes it to the end user

Motivation

I have a use case where part of the custom tab bar needed to overlap part of the scene. The only way to do it would be to add a negative top margin to the Pager view, however the style prop that is exposed on the Pager view is not exposed on the TabView so currently I can't achieve this use case.

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