Add version requirement check in Http() to require latest-released akka

We should add a check similar to https://github.com/akka/akka-http/blob/master/akka-http-core/src/main/scala/akka/http/scaladsl/Http.scala#L43
in which we require the latest released Akka, i.e. since we know this Akka HTTP build requires 2.4.14, it should require that there.

This check should be possible to disable via config, in case there's regressions etc.

Start with akka-http-core/src/main/scala/akka/http/scaladsl/Http.scala and compare the referenced Akka implementation. Determine how this build can require Akka 2.4.14 while allowing the check to be disabled through configuration. Done means Http() enforces that requirement and the configuration override is covered by the relevant tests.

Written by the indexing model from the issue text.