Add tool script for testing individual drivers

[hcarter-775]

Description of Change

Add a test_driver.sh script, along with a one-time setup script, to the tools directory, so that developers and agents have access to a slightly more ergonomic driver unit testing framework.

Some context: I have been using basically this script for a couple years now, and am trying to bring this to the more generic experience (like for AI tools). I had AI mostly generate the AGENTS documentation, and the QOL script for setting up an alias. The actual test_driver.sh script was pre-existing for me

[cjswedes]

I see why you have been using this. However, rather than having two different test scripts, I think I would prefer to see new functionality integrated into the existing script (luacheck, installable to PATH, output file option, etc.).

If there is a different format for output that you think works better for agents (to save tokens or whatever the reason), we could add a new option that changes output to the existing script.

I dont love jamming everything in one script, but it would be useful for development to have luacheck/coverage and test running possible with one command. But I dont think we want to maintain this script along the existing one.

[cjswedes]

We should not have to update 2 places to use this

[cjswedes]

IMO this is a somewhat complex bash script and python is more maintainable. That aside, it is another barrier for developers on windows, which is the main reason why we should not add this script.