Fix authorization on SCIM me endpoint and improve SCIM user extension

[enricovianello]

Fixes #748 and #763.

SCIM me endpoint AuthZ was not working without scopes. Now authenticated users can retrieve again their info without problems. In addition, our SCIM user extension "IndigoUser" has been extended in order to add:

• user's list of attributes (in read mode)
• user's isAdmin T/F info (read mode)
• user's list of managed groups (read mode)
• user's AUP signature (in read mode)
• user's end-time (in read mode)

In order to include managed groups into SCIM users details you need to enable them through the property:

scim:
  include_managed_groups: true

or through the environment variable:

IAM_SCIM_INCLUDE_MANAGED_GROUPS=true

Attributes can be included into SCIM user response in the same way the labels are:

scim.include_attributes[0].name=attribute-name
scim.include_attributes[1].name=another-attribute-name

SCIM me output example:

{
   "id":"80e5fb8d-b7c8-451a-89ba-346ae278a66f",
   "meta":{ ... },
   "schemas":[
      "urn:ietf:params:scim:schemas:core:2.0:User",
      "urn:indigo-dc:scim:schemas:IndigoUser"
   ],
   ...
   "urn":"indigo-dc:scim:schemas:IndigoUser":{
      "oidcIds":[ ... ]
      "samlIds":[ ... ],
      "isAdmin": "false",
      "attributes":[
         {
            "name":"nickname",
            "value":"tester"
         }
      ],
      "endTime": "2024-08-06T02:00:00.000+02:00",
      "managedGroups":[
         {
            "display":"Analysis",
            "value":"6a384bcd-d4b3-4b7f-a2fe-7d897ada0dd1",
            "$ref":"http://localhost:8080/scim/Groups/6a384bcd-d4b3-4b7f-a2fe-7d897ada0dd1"
         },
         {
            "display":"Production",
            "value":"c617d586-54e6-411d-8e38-64967798fa8a",
            "$ref":"http://localhost:8080/scim/Groups/c617d586-54e6-411d-8e38-64967798fa8a"
         }
      ]
   }
}

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud