participantoverlay: add recording state

src/app/callparticipantsmodel.cpp

src/app/callparticipantsmodel.h

src/app/constant/JamiTheme.qml

src/app/mainview/components/ParticipantOverlay.qml

src/app/mainview/components/ParticipantsLayer.qml

src/app/mainview/components/ParticipantsLayoutHorizontal.qml

src/app/mainview/components/ParticipantsLayoutVertical.qml

src/libclient/api/callparticipantsmodel.h

src/libclient/callparticipantsmodel.cpp