Add Dummy congestion controller for testing and experiments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.38%. Comparing base (40c816d) to head (c7c5c79).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #274 +/- ## =========================================== - Coverage 95.39% 95.38% -0.01% =========================================== Files 49 50 +1 Lines 33352 33483 +131 =========================================== + Hits 31815 31937 +122 - Misses 1537 1546 +9 ```

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