Feature: Add LDAP for authentication

[kool2zero]

Is your feature request related to a problem? Please describe.
I would like to be able to have users log into the app via LDAP, so when their passwords change, they do not have to go into here and change it.

Describe the solution you'd like
Add the ability to be able to authenticate through LDAP. This would allow users to have to remember one less credential.
This initial provisioning of a user could be that a user is created at login and an admin would have to "approve" the user.
The other option is that the user would have to be "added" in a user registry prior to logging in.
This might also mean that a default user and password would need to be set up so that the first user to log in would have admin rights.

Describe alternatives you've considered
Possibly putting an authentication layer like Authentik in between the user and the app.