databases/py-mariadb: New port: Python MariaDB extension

MariaDB Connector/Python enables python programs to access MariaDB
and MySQL databases, using an API which is compliant with the Python
DB API 2.0 (PEP-249). It is written in C and Python and uses MariaDB
Connector/C client library for client server communication.

WWW: https://www.github.com/mariadb-corporation/mariadb-connector-python

PR: 275157