Range facet for numeric fields and/or few value (a,b,c…)

[alexgarel]

We would like to have a range selection facet.

It is transformed in a query like nutrition_grades:["a" TO "c"]. ('*' for unbound)

Tasks

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1. Support range facet for numeric field in API (must return min / max using aggregation)
2. add a range facet component for few values (a, b, c…) #226
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3. add a range facet component for numeric fields