Setup linting and formatting dev tools

[fa9r]

I setup dev tools for linting and formatting to improve code quality of our .py files.

Changes:

• Added pyproject.toml that defines all dev tools and their configs. This also enables poetry install to set them up.
• Added scripts for linting, formatting, and spell-checking in scripts/.
• Defined pre-commit hooks in .pre-commit-config.yaml that calls linting and spell-checking.
• Moved all the .py code files into src/ and fixed all linting/formatting issues.

[ayush714]

Really Nice work, It will be also good if you look at adding linting formatting tools in zenfiles as well, nevertheless, let's get this work for zenbytes, then we can take a look later on because it's not urgent.

[htahir1]

One small comment but other than that looks good!

[htahir1]

Really awesome job!