Pub sub blocks (#6139)

* fun start

* playin

* linting

* cleanup kk 1

* cleanup kk 2

* package

* oops

* grumbles

* lint

* lint 2

* all-possible-cases

* conflict resolution

* conflict resolution

* ready

* lint

* remove package-lock

* Restart subscription on transport close.

* Bring back the formatter.

* Fix formatter.