This adds support for the range aggregation over `histogram` mapped fields.
Decisions made for implementation:
- Sub-aggregations are not allowed. This is to simplify implementation and follows the prior art set by the `histogram` aggregation
- Nothing fancy is done with the ranges. No filter translations as we cannot easily do a `range` filter query against histogram fields. This may be an optimization in the future.
- Ranges check the histogram value ONLY. No interpolation of values is done. If we have better statistics around the histogram this MAY be possible.
