More configurable MySQL password policies

[Lemmmy]

Is your feature request related to a problem? Please describe. This is a spin-off of #1852 - servers may have specific MySQL password policy configurations, for example using the MariaDB Simple Password Check Plugin. For example, on my server, our passwords must be >= 64 characters in length, contain lowercase letters, uppercase letters, numbers, and symbols.

Describe the solution you'd like A simple series of checkboxes and a number field input in the Database configuration screen to allow enabling/disabling of character sets, and setting a password length to use.

Describe alternatives you've considered I've considered editing the PHP files manually, but decided this would make upgrading the panel over time more difficult.