feat(react-instantsearch): add Carousel layout component

[shaejaz]

This adds the the Carousel layout component and enables the layoutComponent prop in Recommend widgets. React getting started example has been update to use Carousel as well.

https://algolia.atlassian.net/browse/FX-2819

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 5764eb9:

Sandbox	Source
example-instantsearch-getting-started	Configuration
example-react-instantsearch-getting-started	Configuration
example-react-instantsearch-next-app-dir-example	Configuration
example-react-instantsearch-next-routing-example	Configuration
example-vue-instantsearch-getting-started	Configuration

[sarahdayan]

Almost there, a couple changes and we should be good.

I also noticed that the box shadow is being cut off in demo because of the overflow ruleset. I fixed it in the JS example, feel free to compare markup and styles to replicate it.

[Haroenv]

🔥

[Haroenv]

does this mean the "previous" and "next" labels aren't customisable, or is that done another way now?

[sarahdayan]

The translations we passed were the ones of the widget, and it didn't make sense to do so. Layouts have their own translations which they receive as a prop, but there's no point in passing widget translations.

This was carried over from the previous design from Recommend v1 where slider translations were all at the widget level, but the design we created makes them independent. This is also the reason why we should most probably deprecate the sliderLabel translation.

[dhayab]

👏