Show password hashes on User List API

**Is your feature request related to a problem? Please describe.**

We're running authentik in conjunction with another subordinated identification system that wants to validate user password on their side.

However the password is not shown in the API endpoint /core/users/ response.

**Describe the solution you'd like**
A switch like `include_groups` that will signal authentik to return the password hashes stored in the DB out of the API. Probably also a designated permission so the passwords are only exposed to a user with the specific permission.

**Describe alternatives you've considered**
We have an implementation in #15572 *

Besides implementing it ourselves we were (ab-)using LDAP as a "bus" for transmitting password information across systems, due to our design we want to avoid (ab-)using LDAP for this purpose.

**Additional context**

Firefox screenshot of the API Response: