[Orc] Refactor debug section requirements into a more flexible flags field (NFC)

When the initial DebugObjectManagerPlugin landed, it was not clear whether we will have more patching requirements for debug section. Also, there were no other use-cases for debug object flags.
Adding options to the plugin gives us a use-case and we can re-use the field for it. This commit only refactors the infrastructure in preparation for two more patches to come.