feat(templates): add React Native templates

[samouss]

The PR adds a "React InstantSearch Native" template that use react-instantsearch-native.

• The template don't handle attributesForFacetting it's a bit hard to implement because there is a lots of condition. The code is a bit more complicated than the web in order to have a RefinementList
• In case we don't provide mainAttribute the Highlight file is generated but unused

[francoischalifour]

That's great, thank you for this!

[francoischalifour]

One thing to note is that although this template will be released in the templates branch, it won't be available on CodeSandbox.

Could we offer a similar experience with React Native? With Expo?

[Haroenv]

seems like it's possible: https://forums.expo.io/t/modules-available-in-snack/1651/16

[francoischalifour]

Can it be loaded from a GitHub URL?

[Haroenv]

looking for that option now (asked on twitter)

edit: quickly made sure it worked in snack: https://snack.expo.io/B1RIWR1ZQ, not sure yet how to load from url

[samouss]

Yes it would be nice but at least the template is available from the CLI.