Draft: pleroma installer and config versioning

  • added DynamicSupervisor, which starts Pleroma deps and restarts config dependent deps
  • added pleroma installer, where user can configure database credentials and pleroma config. Settings are saved into file and in database
  • added versioning for in database config. New version is created from changes which are passed to config update/delete endpoint. Every version contains backup with all changes added through update. Versioning supports rollbacks with N steps. With a rollback, all versions that come after the version on which the rollback was made are deleted.

Closes #2145

Edited by Alexander Strizhakov

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