[Tooling] Make our `tox.ini` more friendly to interactive use

[kdestin]

Is your feature request related to a problem? Please describe.

Quality checks (formatting, linting, etc...) for packages in this repo are enforced by required PR checks. But waiting on a PR check can be a large time sink to get feedback that you forgot to format your code, fix a small lint, etc...

There are a couple changes that could be made to the tox.ini to clean-up the output and make it run a bit more quickly when run interactively

Describe the solution you'd like

• Move all package installation out of the commands section, so they can be silenced with --quiet. This would require some custom implementation (e.g. additional deps fields) to permit the installation of packages that require "sticky" pip arguments (--index-url).
• Amortize the time cost it takes to run the create_package_and_install.py step repeatedly. As currently implemented, the package gets rebuilt and re-installed every time the tox environment is run. Allowing tox to manage the re-installation of a package's dependencies would drastically speed up runs of tox after the first invocation.

Describe alternatives you've considered

N/A

Additional context

N/A

@scbedd

[github-actions]

Hi @kdestin, we deeply appreciate your input into this project. Regrettably, this issue has remained unresolved for over 2 years and inactive for 30 days, leading us to the decision to close it. We've implemented this policy to maintain the relevance of our issue queue and facilitate easier navigation for new contributors. If you still believe this topic requires attention, please feel free to create a new issue, referencing this one. Thank you for your understanding and ongoing support.