pdc: add Refresh indication

I still need to get permission to add the TLV that allows us to subscribe to this indication, but this is its message structure. It can be used to signal to the host that we received an OTA profile update and need to fetch the profile list again, at which point ModemManager can also notify any consumers of the profiles list.

Once we can subscribe, we can also add a qmicli monitor command for testing purposes.

I'll also try and figure out how to get this tested before pushing as OTA profile list updates require control of the network as well, unless there are test commands that can be used to simulate the behavior on the modem directly.