Expose capability to deny access in OCS API

[labkode]

@phil-davis will need help on this one to pass the tests.

[labkode]

Refactor the code to use additional attributes rather than playing with the permission bits:

{
  "ocs": {
    "meta": {
      "status": "ok",
      "statuscode": 200,
      "message": null,
      "totalitems": "",
      "itemsperpage": ""
    },
    "data": [
      {
        "id": "125266",
        "share_type": 0,
        "uid_owner": "jfd",
        "displayname_owner": "Jörn Friedrich Dreyer",
        "permissions": 1,
        "stime": 1624566341,
        "parent": null,
        "expiration": null,
        "token": null,
        "uid_file_owner": "jfd",
        "displayname_file_owner": "Jörn Friedrich Dreyer",
        "additional_info_owner": null,
        "additional_info_file_owner": null,
        "path": "/test.odp",
        "mimetype": "application/vnd.oasis.opendocument.presentation",
        "storage_id": "home::jfd",
        "storage": 20,
        "item_type": "file",
        "item_source": 5429442,
        "file_source": 5429442,
        "file_parent": 4065,
        "file_target": "/Shared/test.odp",
        "share_with": "fschade",
        "share_with_displayname": "Florian Schade",
        "share_with_additional_info": null,
        "mail_send": 0,
        "attributes": "[{\"scope\":\"permissions\",\"key\":\"download\",\"enabled\":false},{\"scope\":\"richdocuments\",\"key\":\"view-with-watermark\",\"enabled\":true},{\"scope\":\"richdocuments\",\"key\":\"print\",\"enabled\":true}]"
      }
    ]
  }
}

[ishank011]

Duplicate of #2733