[php-src] Issue #20306: Implement PARSEC auth for mysqlnd

Issue: https://github.com/php/php-src/issues/20306 Author: bjoernv ### Description MariaDB 11.8 added the PARSEC (Password Authentication using Response Signed with Elliptic Curve) authentication plugin. See [Authentication Plugin Added: PARSEC](https://vettabase.com/mariadb-11-8-lts-parallel-dumps-parsec-authentication-new-sql-syntaxes-and-more/#Authentication_Plugin_Added_PARSEC) PARSEC can be seen as an enhancement of the ED25519 authentication plugin. There is already a feature request for ED25519: #14258 Currently the PARSEC authentication is unsupported in PHP mysqlnd: mysqli_sql_exception: The server requested authentication method unknown to the client [parsec] in parsec-connect.php on line 20