Allow contentContainerCustomStyle override default paddings.

[yamov]

Platforms affected

iOS, Android

What does this PR do?

It allows the contentContainerCustomStyle prop override the default paddings. The default paddings do not always work nicely with all designs.
The change itself is pretty trivial.

What testing has been done on this change?

Tested on Android And iOS for a simple use-case

<Carousel
  ...
  contentContainerCustomStyle={{ backgroundColor: 'red', paddingLeft: 10, paddingRight: 0 }}
/>

Tested features checklist

• Default setup (example)
• Carousels with and without momentum enabled (prop enableMomentum)
• Vertical carousels (prop vertical)
• Slide alignment (prop activeSlideAlignment)
• Autoplay (prop autoplay)
• Loop mode (prop loop)
• ScrollView/FlatList carousels (prop useScrollView)
• Callback methods
• ParallaxImage component
• Pagination component
• Layouts and custom interpolations

[bd-arc]

Shipped in version 3.8.0.