[Feature Request] Multiple cabinet/drawers/organizations/tenants/properties within the same instance with unique properties

Description Re-opening the (sadly) closed #1988 which did seem to have a lot of community support. A way to segment documents, correspondents, storage spaces, etc. The use case could be very different types of documents: • Personal Documents (home bills, credit cards, medical, taxes, vehicle, investments, kids) • Operating Company 1 (vendor invoices, taxes, customer invoices, financial information) • Holding Company 2 (investments, vendor invoices, taxes, financial information) • Spouse's Documents (...) Ideally, one paperless instance could be used to manage all of these properties (to avoid an extra 500MB+ of memory consumption of running another instance of paperless-ngx, as well as having one consume folder. In the traditional sense, you'd want a separate filing cabinet drawer for it with its own files. You probably want storage spaces to keep those files on disk separate. Having every vendor Company1 has worked with mixed in wi…