Change archiver to work resource id based

[kulmann]

As I've learned in #2096 the archiver service currently works with absolute paths. That brings at least two limitations:

1: we need configuration for the web ui for defining a path prefix. In the CERN-Box environment this is not needed (/), for any standard ownCloud environment it would be /home. This kind of knowledge should not be needed in the web UI (+ this will not work with our spaces implementation)
2: similar to (1) folder downloads will not work for public links

Switching to resource id based file/folder selection for the archive will resolve (1) and (2). Additionally it will allow us to have support folder downloads on password protected public links without extra effort after owncloud/ocis#2536 is merged.

[kulmann]

cc'ing @wkloucek for more details if needed

[gmgigi96]

The current archiver implementation has the same interface of an old archiver service, we used, and yes, it is limited.
So, I will change the interface to support both paths and resources ids, providing to the archiver a list of path and/or a list of id.

[kulmann]

Awesome, thank you 🤩

[butonic]

Related: owncloud/ocis#2521

Cc @kulmann I don't know if @jvillafanez looked into this as well.