Implement delay line component

Hi!

How to implement a delay line component with single thread and no autotick. We are simulate digital logic with explicitly call Tick() only on input values change. Is where a canonical way? Maybe use timer, FIFO or somewhere else?

```
  -----      ---------------------        -----
|   A  | --> |   Delay (seconds)  |  --> |  C  |
  -----      ---------------------        -----
```