Add in configuration for Password Policy to set user context fields

[nerdstein]

Make this overridable from the default username and mail fields

[nerdstein]

This relates to the Password Strength module, where it uses the user object to determine how strong the password is. e.g. you can't use your first or last name in your password.

Right now, username and mail are the only attributes passed, because these are the only attributes that are guaranteed to be built into the user object.

The purpose of this ticket is to build additional user objects exposed to plugins, and use password strength to parse them as an example.

Be mindful, this needs to be dynamic! These fields can change per Drupal system

[nerdstein]

Removing this and will track later if needed