Functions to query databases and a macro to generate a local database API.

The functions in this namespace provide a java.jdbc-like API for querying
databases using HoneySQL queries. It assumes you will manage database
connections in your application.

[[dbee.core/defdb]] will create an opinionated local database API based on the
functions defined in this namespace. For configuration options and example
usages, refer to the `defdb` docstring.

The functions used with either use case accept a number of common options.
Those options include the following:

* `:long-running-threshold`

The number of milliseconds to use as a long-running threshold. If queries
exceed this value, a warning will be logged that includes the query and
the run time. This value will override any default or configured value.

* `:row-fn`

A function that will be executed against every row returned from the
database. This value will override any default or configured value.

* `:result-set-fn`

A function that will be applied to the entire returned result set.