Implement throttle function

[cabol]

1. Define the callback. For example (initial proposal):

@callback with_throttling(
            Throttlex.Bucket.Counter.counter(),
            max_rate :: pos_integer | [pos_integer],
            fun
          ) ::
            {:ok, term} | {:error, :max_rate_exceeded}

2. Implement it.

3. Add tests.

Fee free to give your proposal and discuss it with the team.