Draft: libqmi-glib,endpoint-qrtr: add support for the --client-cid option
If the CID is not present in the clients list because the --client-cid option is being used add the CID to the list instead of returning an error.
I'm marked it as draft because I'm not sure if is the correct solution, maybe I should add the CID only if --client-cid option is being used? But I don't know how to pass this information from the qmicli to the qmi-proxy.