Support getPeersForCall for federated calls

[SystemKeeper]

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Currently getPeersForCall is not supported for federated calls. On talk-ios we are using that API to determine 2 things, while the phone is ringing:

• When there are no peers returned, we stop ringing, because the other participant ended the call.
• When we join from another device (e.g. web) there's no reason to keep ringing and we hang up as well

spreed/lib/Controller/CallController.php

Lines 62 to 105 in f5caaa6

	/**
	* Get the peers for a call
	*
	* @return DataResponse<Http::STATUS_OK, TalkCallPeer[], array{}>
	*
	* 200: List of peers in the call returned
	*/
	#[PublicPage]
	#[RequireCallEnabled]
	#[RequireModeratorOrNoLobby]
	#[RequireParticipant]
	#[RequireReadWriteConversation]
	public function getPeersForCall(): DataResponse {
	$timeout = $this->timeFactory->getTime() - Session::SESSION_TIMEOUT;
	$result = [];
	$participants = $this->participantService->getParticipantsInCall($this->room, $timeout);
	foreach ($participants as $participant) {
	$displayName = $participant->getAttendee()->getActorId();
	if ($participant->getAttendee()->getActorType() === Attendee::ACTOR_USERS) {
	if ($participant->getAttendee()->getDisplayName()) {
	$displayName = $participant->getAttendee()->getDisplayName();
	} else {
	$userDisplayName = $this->userManager->getDisplayName($participant->getAttendee()->getActorId());
	if ($userDisplayName !== null) {
	$displayName = $userDisplayName;
	}
	}
	} else {
	$displayName = $participant->getAttendee()->getDisplayName();
	}
	$result[] = [
	'actorType' => $participant->getAttendee()->getActorType(),
	'actorId' => $participant->getAttendee()->getActorId(),
	'displayName' => $displayName,
	'token' => $this->room->getToken(),
	'lastPing' => $participant->getSession()->getLastPing(),
	'sessionId' => $participant->getSession()->getSessionId(),
	];
	}
	return new DataResponse($result);
	}