!str #15271 make transform() take a factory instead of Transformer
+ Makes reusing flows safe
+ Adds timerTransform for ops which need TimerTransformer
+ Adds TransformerLike in order to keep transform/timerTransform
  typesafe in respect to the passed in type og Transformer

Resolves #15271
Merge pull request #15725 from ktoso/wip-transformerFactory-ktoso

!str #15271 make transform() take a factory instead of Transformer