Clean dependency files

[gmuraru]

Description

• Remove all the dependencies that we have in the requirements.txt file and put those in the setup.cfg.
• Remove the requirements.txt file from the GA workflows.

Are you interested in working on this improvement yourself?

• Yes, I am.

Additional Context

Add any other context or screenshots.

[shubhank-saxena]

I would like to take this on @rasswanth-s . Does this issue also need to shift requirements.dev.txt to be shifted as well, since the end goal is to delete requirements.txt?

[rasswanth-s]

You would have to shift both into setup.cfg , you could refer PySyft's setup.cfg .This would involve modifying the workflows files on install Dependencies section ,to be pip install -e .[dev] , and also the README for the new installation method.