pip: split req.txt to req-dev

[glimchb]

see https://github.com/opiproject/ansible-opi-dpu/blob/main/requirements.txt

[MAVRICK-1]

@glimchb can you assign me this,
requirements-dev.txt: Contains dependencies required for development purposes.?

[glimchb]

Yes, for example, we don’t need lint during runtime…