Switch to akka typed

[johanneshiry]

The current implementation relies on akka classic which does not include type safety for message passing between actors. In the mid-term it would be very helpful to have akka typed support in order to have a more safe and stable protocol handling. This also might require some protocol adaptions and it may be helpful to have a documentation of the existing protocols available beforehand.

Tasks

• [ ] add documentation for existing agent and actor communication protocols
• [ ] adapt existing protocols for akka typed
• [ ] adapt the code to support akka typed