+str #15558 Initial delay support for TickProducer
Merge pull request #15557 from 13h3r/wip-initial-delay-for-tick-producer-13h3r

Initial delay support for TickProducer
!str #15564 Add stream supervisor

* this is the first step, to enable safe FlowMaterializer that can be shared
* had to remove Log because of missing context (we need another solution for log)
* naming of the actors have changed, should be revisited