#60 displayname added to JWT

[dk1844]

The user token now optionally contains field displayname for a friendly name string. This either comes from LDAP's displayname field or from user config (also displayname field).

Some unit tests added/adjusted.

FYI @fateeand

Example - config-based:

With config of

            - username: "TestUser"
              password: "password123"
              displayname: "Test User MD"
              email: "test@abs.com"
              groups:
                - "groupA"
                - "groupB"

the token contains this information:

{
  "sub": "TestUser",
  "exp": 1692365356,
  "iat": 1692350956,
  "groups": [
    "groupA",
    "groupB"
  ],
  "email": "test@abs.com",
  "displayname": "Test User MD"
}

Example - LDAP-based:

.. tested against company LDAP

{
  ...,
  "displayname": "Daniel Kavan (CZ)"
}

[github-actions[bot]]

JaCoCo code coverage report - scala:2.12.17

File	Coverage [58.07%]	:x:
OptionExt.scala	100%	:green_apple:
User.scala	100%	:green_apple:
JWTService.scala	83.51%	:green_apple:
ConfigUsersAuthenticationProvider.scala	74.19%	:x:
UsersConfig.scala	71.92%	:x:
ActiveDirectoryLDAPAuthenticationProvider.scala	18.6%	:x:

Total Project Coverage	74.87%	:green_apple: