refactor query builder api *breaking change*

[cylkdev]

The current implementation of the EctoShorts.QueryBuilder api is written in a way that is specific to the internal function calls of the api. This change makes the callback function create_schema_filter a 3-arity function and re-arranges the order of the arguments so that the query is the first argument which allows these functions to be chained together.

[cylkdev]

@MikaAK My current understanding is that there is no expectation that this was to be used prior to this and therefore it was not documented. This change will allow us to better support #47 and we can add it to the documentation.

[BobbieBarker]

lgtm