Use black to as Python code formatter

Hello GitCoin devs!

Checkout Black: https://black.readthedocs.io/en/stable/

Use it to format and fix formatting issues in Python code.
The code would be easier to read.

Read the Black documentation linked in the issue, then locate the repository's Python code and any existing formatting workflow. The issue names no files or tests, so define the intended scope before applying Black and verify that the Python formatting issues are resolved.

Written by the indexing model from the issue text.