Add db_server_info()

[WPprodigy]

WP 5.5 added this method: https://github.com/WordPress/WordPress/blob/9c3b7e5e7c94f3f8c5f3766a0d25e801b39a81a5/wp-includes/class-wpdb.php#L3858-L3873

Using it can cause errors on sites though, because hyperdb might not have a connection ready to go, so you end up with:

Warning: mysqli_get_server_info() expects parameter 1 to be mysqli, null given in /var/www/wp-includes/class-wpdb.php on line 3867

We need to do the same thing we did for db_version() to resolve this. I have some questions though I'll leave in review comments.

[sonarcloud[bot]]

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