Write related ORC files in the same directory using the same UUID
related ORC files being ORC files involved in the serialization of a given
object type, namely:
- snapshot and snapshot_branches,
- revision and revision_history,
- directory and directory_entry.
Also include the object_type in the generated file name (in place of the
static 'graph').
So the result will typically be like:
output/orc/shapshot/ snaphot-18a575cb-3a92-4753-9267-e3475fa30857.orc snaphot_branch-18a575cb-3a92-4753-9267-e3475fa30857.orc snapshot-1f41d206-994a-49bb-917f-e096e40c2856.orc snapshot_branch-1f41d206-994a-49bb-917f-e096e40c2856.orc