Merge url query args to opts in mariadbconnector like mysqldb

Merge url query args to opts in mariadbconnector like mysqldb

Fixed issue in mariadbconnector dialect where query string arguments that
weren't checked integer or boolean arguments would be ignored, such as
string arguments like ``unix_socket``, etc.  As part of this change, the
argument parsing for particular elements such as ``client_flags``,
``compress``, ``local_infile`` has been made more consistent across all
MySQL / MariaDB dialect which accept each argument. Pull request courtesy
Tobias Alex-Petersen.

Fixes: #11870
Closes: #11869
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/11869
Pull-request-sha: 8fdcabc83b548e3fc19aa1625035d43ebc0e1875

Change-Id: I3a11a0e65e118c94928027478409488b0d5e94f8