Add RICE binding for definition of a domain from values

[bgastinne-algolia]

Hello,

When trying to use this library for a project (thank you by the way!) I was missing this function (it creates a domain from a list of distinct values instead of a range) that was available in my Python POC.

Adding this line was enough to have it working on my side, let me know if it's enough to add the function upstream too.

[ankane]

Thanks @bgastinne-algolia! I think it'd be better to use define_singleton_function, so updated in the commit above.

[bgastinne-algolia]

Awesome, thanks!