✨ New python binder for function-services

[pcrespov]

What do these changes do?

Adds support for python-based services and some extra fixes

• .osparc/
  • 🐛 fixes on bin/ooils.bash: pull image if does not exists
  • ✨ bin/python_binder_program.py : new python binder for python-based "function services"
  • ✨ requirements.txt: dependencies for the latter
• 📝 improves doc
• ♻️ cookiecutter
  • cookiecutter.json changed defaults for Dockerfile
  • hooks/post_gen_project.py: cleans config for python image_base

Related issue/s

• function services osparc-simcore#3418

How to test

make devenv
source .venv/bin/activate
make play

Checklist

• python Dockerfile: copy always .osparc and install requirements. add PATH=.osparc/bin . Implement CMD with binder
• ooil as executable
  • bug with docker-compose-override.yml ... dockerfile: docker/python/Dockerfile does not work with docker compose
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