* #22506 Mark materializer extension as @InternalApi
* #22506 Added missing annotations on internal apis in the fusing package
* #22506 Missing annotations in io package
* #22506 Add internal api annotations in impl package
* #22563 more hiding of the classes in the impl package
* #22563 Formatting fixes
* #22506 Fix private access in stream tcl tests
The TCK tests are using System.gc(), which
is causing long GC pauses when running with G1 on
the CI build servers. Therefore we fork these tests
to run with small heap without G1.
* remove settings duplication between AkkaBuild and project specific .sbt files
* do not publish test projects
* run akka-http-core tests
* fix lambda sample project versions
* remove obsolete projects (streamAndHttp, httpParent, docsDev)
* exclude parsing project from unidoc
* update to the latest sbt
> merged akka-bench-jmh-dev with akka-bench-jmh
> renamed akka-stream-tck to more correctly named akka-stream-tests-tck
> merged java8 tests with normal tests in http