Random Password with Configuration

Allows two optional properties to help with the password generation portion.

ASSIGN_RANDOM_PASSWORD_PROPERTY_FIRST
ASSIGN_RANDOM_PASSWORD_PROPERTY_SECOND

These are intended as JWT properties that will be used as part of the password generation function.

Again, this password is never actually accessible, but the goal is to still generate a sufficiently weird password and pass the pipeline stages for plugins within Moodle.