contactmodel: emit contactAdded when having incoming call from new SIP contact
contactmodel: emit contactAdded when having incoming call from new SIP contact

https://git.jami.net/savoirfairelinux/jami-client-qt/-/issues/455

Change-Id: I70901b2264d439e7d7d15763c92b95116e0f4442

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc