Add option to enable/disable MySQL SSL support via mysql_options

Currently, Drogon calls `mysql_options(mysqlPtr_.get(), MYSQL_OPT_NONBLOCK, nullptr);` when configuring MySQL connections. To better support users who need to enable or disable SSL (for example, with MYSQL_OPT_SSL_MODE or MYSQL_OPT_SSL_ENFORCE), please add a way to configure this behavior via Drogon’s database configuration. This would make it easier to comply with different security requirements or local policies.