@spec start_link(pid(), map()) :: {:ok, pid()}

Spawns a new TURN cleaner and links it to calling process.

pid is a pid of a process to monitor and turn is an TURN server to terminate when process with pid pid exits.

@spec start_under(Supervisor.supervisor(), pid(), map()) ::
  DynamicSupervisor.on_start_child()

Spawns a new TURN cleaner under supervisor supervisor.

pid and turn have the same meaning as in start_link/2.