Combine API endpoints to reduce SQL duplication

[copelco]

I'm thinking it might be more efficient to simplify the API to two calls: stops and stops by reason.

Stops:

    {
        "stops": [{...}],
        "searches": [{...}],
        "contraband": [{...}],
        "use_of_force": [{...}],
    }

Stops by reason:

    {
        "stops": [{...}],
        "searches": [{...}],
    }

I'm not sure how much this would change the front-end code though. Just a proposal/thought for now.

[shapiromatron]

I think that's a good idea and it'll reduce the API calls overall; open for the frontend refactoring needed to do so.