[feature] Implementation for --version command

[H4ppy-04]

Required implementation for --version command.

Implementation spec:

• Specify __version__ to be read from setup.py with setuptools-scm

This ensures that:

1. Version doesn't have to be updated manually
2. Version is called from Git instead of being managed within a file or dunder constant.

Requires:

• Nixos dependency modification as https://pypi.org/project/setuptools-scm/ is external.

• Modification of setup.py into something like

  from setuptools import setup
  
  setup(
      use_scm_version=True,
      setup_requires=['setuptools-scm'],
  )