Add pre-commit hook to avoid print statements.

[Dhruvanshu-Joshi]

Description

As discussed in #693, we'd like to avoid unnecessary print statements before committing the changes itself. This way, we can avoid unnecessary debug statements.
PyMC already has this implemented within the pymc/.pre-commit-config.yaml module.
We'd like to keep the print statements that already exists untampered and must be excluded.

[ricardoV94]

The alternative for the print statements that should exist is to pass the kwarg file=sys.stdout to print. But there might be many that should not exist!

pymc-devs/pymc@cdc6a39

[jessegrabowski]

Should probably use the logger for anything that is actually supposed to be printed to the console?