peerdiscovery: add functionality of discovering Jami Account

bin/dbus/cx.ring.Ring.PresenceManager.xml

bin/dbus/dbusclient.cpp

src/client/ring_signal.cpp

src/dring/account_const.h

src/dring/presencemanager_interface.h

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h