lb-dev/lb-project-init: add support for projects using pre-commit

As discussed at Core Software Meeting, we will gradually migrate from custom sanity checks (e.g. formatting) scripts to pre-commit hooks.

• lb-project-init should implicitly call pre-commit install if the project comes with a .pre-commit-config.yaml
• lb-dev should inherit the .pre-commit-config.yaml from the main project (if it exists) and invoke pre-commit install if appropiate