Add AAS Server and Client

[s-heppner]

This issue is to track the development of Part 2 of the specification

[s-heppner]

The API is being implemented in #238

An instantiable server can be found in https://github.com/rwth-iat/basyx-python-sdk-http-server-docker

A client can be found at https://github.com/rwth-iat/aas-python-http-client