Add pre-commit hooks similar to what pip has to pipenv

[matteius]

Similar to how pip has pre-commit configuration: https://github.com/pypa/pip/blob/main/.pre-commit-config.yaml

It would be great for pipenv to adopt such linting tools as well. That way we don't have to debate stylistic differences on PRs or have things not flake8 complaints. sorting imports for example can be time consuming but with isort that becomes a non-issue. There are more benefits to be had as well.

Describe the solution you'd like

I will open a PR to try and add this supported. Would like to also have it run as part of the build process, and some help on the .githup action may be required, we'll see.