Write ocs end-points for occ commands and other admin settings - continued

Followup for all not completed task from 12: #2694

I would be good to have a OCS API for all our occ and admin settings so that a Nextcloud installation can be administrated from outside.

Here is a list of what we need:

• config
  • import
  • list: provisioning_api for apps
  • system:delete
  • system:get
  • system:set
• encryption:
  • change-key-storage-root
  • disable
  • enable
  • list-modules
  • migrate
  • set-default-module
  • show-key-storage-root
  • status
• files
  • files:cleanup
• integrity:
  • integrity:check-app
  • integrity:check-core
• ldap:
  • ldap:check-user
  • ldap:search
  • ldap:show-remnants
  • ldap:test-config
• maintenance:
  • maintenance:mimetype:update-db
  • maintenance:mimetype:update-js
  • maintenance:repair
  • maintenance:update:htaccess
• user
  • user:lastseen
  • user:report
  • user:resetpassword
• versions
  • versions:cleanup

Please double check for your apps @nickvergessen @blizzz @rullzer @icewind1991 @LukasReschke @schiessle

Start by reviewing the incomplete work from issue #2694 and the existing OCS API alongside the listed occ commands and admin settings. Break the request into individual command groups, then verify that each required configuration, encryption, files, integrity, LDAP, maintenance, user, and versions operation has an OCS endpoint and that the complete checklist is covered.