+per #13815 akka-persistence-tck based on @krasserm's work

Forward port to `master`. @2m please check if I did the builds stuffs properly here (builds ok on my machine, but maybe I missed some nuances)

Original here: https://github.com/krasserm/akka-persistence-testkit

New features:
* merged martin's tests
* usable from java (junit 4)
* simple bench test, which helps checking if ordering is perserved under
  bigger workloads and simple perf checking
* does NOT include tests for already deprecated features (deleteMessages)
* docs

Resolves #13815

Conflicts:
	project/AkkaBuild.scala