Dependencies <todo>

[5A11]

• Check how much is command-line click-based AEA integral. What is the reach of the cli? Can everything be done without it? Is there a common use-case for using AEAs programmatically without the cli? If so, have a clear separation of roles for cli and non-cli versions (deps-wise).
• tox -e dependencies_check is disabled. The script used is no compatible with poetry (it reads setup.py). Need to adapt it to poetry and enable it.