Implement PCI hotplug in Propolis as described in [RFD616](<https://rfd.shared.oxide.computer/rfd/0616>) and API changes as described in [RFD632](<https://rfd.shared.oxide.computer/rfd/0632#_propolis_api_changes>).
Implement PCI hotplug in Propolis as described in RFD616 and API changes as described in RFD632.