This is a binding to libpq: the C application programmer's interface to PostgreSQL. libpq is a set of library functions that allow client programs to pass queries to the PostgreSQL backend server and to receive the results of these queries.
- Drop support for GHCs prior 8.6
- Require libpq >=10.22 (when using pkgconfig).
- Use CApiFFI for some parts of the API (we cannot use for all due https://gitlab.haskell.org/ghc/ghc/-/issues/22043)
- Support GHC-8.6.1
- Add simple smoke test