Fix #7: Add idType param to useParticipantIds

[rileyjshaw]

See #7 for discussion.

[troutowicz]

Would love to see this merged. What we have now works, but adds work.

function useParticipantUserIds({filter}) {
  const daily = useDaily()
  const localSessionId = useLocalSessionId()
  const participantIds = useParticipantIds({filter})

  const userIds = useMemo(() => {
    const userIds = []
    const participants = daily.participants()
    for (let i = 0; i < participantIds.length; i++) {
      const id =
        participantIds[i] === localSessionId ? 'local' : participantIds[i]
      if (participants[id]?.user_id) {
        userIds.push(participants[id].user_id)
      }
    }
    return [...new Set(userIds)]
  }, [daily, localSessionId, participantIds])

  return userIds
}