Allow removing member

Please allow removing members.

1. Swarm panel
2. Right-click on a member (whether accepted invitation, invited, banned/blocked, etc)
3. Click Remove member (currently not implemented)

This may help with removing members who are invited and have not received an invitation and then sending a new invitation.

Could be a workaround to contacts who have been invited to swarms and have not received the invitation and it is currently not possible to send a new invitation as they have already been sent an invitation.

Also could be a workaround as kicking and re-adding a contact does not work to send a new invitation notification.

Does the solution involve implementing removeParticipant()?

https://git.jami.net/savoirfairelinux/jami-client-qt/-/blob/master/src/libclient/callmodel.cpp#L898-903

void
CallModel::removeParticipant(const QString& callId, const QString& participant) const
{
    Q_UNUSED(callId)
    Q_UNUSED(participant)
    qDebug() << "removeParticipant() isn't implemented yet";
}

Thank you