Debug version of Grains.Timer.

To replace the normal Timer with this, start you bread like this:

recipe = Recipe.new(:Periodic, %{
    Source => Grains.periodic(Sink, 10, %{with_timestamps: true}),
})

grains = Grains.new(%{
      Source => {Source, %{}, []},
      Sink => {Sink, %{}, []},
      Source.Timer.Sink => {Grains.DebugTimer, [], []}
})
{:ok, bread} = Grains.Supervisor.start_link(recipe, grains, id: Test)

debug_timer = Grains.get_name(bread, Source.Timer.Sink)
send(debug_timer, :tick)

With Timestamps

Similarly to Grains.Timer, the debug timer accepts an option with_timestamps. If set to true, the :tick must include a timestamp, which is then used when forwarding the received message downstream. If with_timestamps is not set, the :tick must not include a timestamp, and the message is forwarded as-is.

With Tags

The debug timer also accepts an option with_tag. If set to an atom, the timer will use pull_with_tag instead of pull.