318 migrate build system to poetry

[tensionhead]

Replace setup.py with poetry

After installing poetry the following steps create a virtual env from the pyproject.toml:

# not sure what is the best way to actually get such python executable
# using conda definetely is an option..
poetry env use /path/to/python3.8
 
# grabs the packages and installs
poetry install

# activate poetry env
poetry shell

With this the syncopy environment was set up and the current shell runs within the virtual environment. As we have ipython in the dev dependencies, firing up this interpreter and import syncopy as spy should already work. Now with poetry build and poetry publish we are in principle already done!

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