Use scim-server-php lib

Make use of scim-server-php (https://github.com/audriga/scim-server-php)

Note: Service Provider Configuration Endpoints (https://datatracker.ietf.org/doc/html/rfc7644#section-4) are broken for now - we are working on it

We used Postman for testing, we need to migrate/merge with insomnia

A list of TODOs:

• Undefined method issue: Could not boot scimserviceprovider: Call to undefined method Opf\\Util\\Util::setSupportedSCIMResourceTypes()
  • Was fixed a while ago
• Issue with vendor/autoload.php inclusion in lib/AppInfo/Application.php
  • This should now be fixed with !2 (6974e3e3)
  • @blank feel free to check our fix if you can/want
• Issue related to spaces in AAD groups name
  • Was fixed in the scim-server-php lib
  • Folder sync from AzureAD should be fully working now (except for memberships, see bellow)
  • @blank feel free to check our fix if you can/want
• Issue with groups members not being synced from AzureAD
  • Is this still the case?
• firebase/php-jwt issue due to clash with same dependency with a different version being used by other nc apps -> possibly use mozart as a fix
  • Should be now fixed
• Groups with name length > 64 chars are an issue and can't be written due to some SQL constraint most probably
  • This is a NextCloud limitation
• Unsupported PATCH requests
  • @pierre are PATCH requests supported in the current version of the app?
  • PATCH requests are not supported by the scim-server-php lib yet
  • May need to be part of a different PR (?)
• README update, esp. the TODO list
  • This is already done
  • May need some improvement depending on all the above
• Service Provider Configuration Endpoints are broken
  • Should be now fixed