databases/py-psycopg2cffi: create port

psycopg2cffi is an implementation of the psycopg2 module using cffi, the C
Foreign Function Interface for Python. psycopg2 is a PostgreSQL database
adapter for the Python programming language.

WWW: https://github.com/chtd/psycopg2cffi

PR: 208686
Submitted by: Joseph Mingrone <jrm@ftfl.ca>