Allow users to create native histograms

[csmarchbanks]

Initial support for allowing users to create native histograms. The initial implementation directly exposes the initial schema version rather than a factor, and we can provide guidance for choosing a good initial schema. If too many buckets will be created then resolution can be reduced, but in the current implementation the other reduction techniques (increasing zero bucket width, resets, etc...) are not yet implemented.

Depends on #1087 for the actual exposition Part of #918

[csmarchbanks]

@krajorama Would you be willing to take a look at this sometime? I tried to describe the differences I made compared to say client_golang, but let me know if you have questions!