Done criteria

1. Introduce the concept of input age aware
   1. Aware objects implement the _set_input_age method
   2. NetworkRollback implements utilities ( same as is_rollback_aware and `process_rollback
2. Simulate nodes regardless of having input
3. Introduce NetworkRollback.discard(what)
   1. Receives a target object
   2. RollbackSynchronizer doesn't record discarded nodes' states
4. Update BaseNetInput to be input age aware
5. Update BrawlerController to discard if input age is not 0