Automate testing of initial sprints in tools module

[LonMcGregor]

• Expected output now in expected folder
• Github action which runs after validation, when Needs Review
• Script that can be run to test locally before push
• Split number sys qs into automatable/manualy checkable

[illicitonion]

Generally looks really good, and very useful!

One thing I really like about the metadata validator one that this doesn't do is collapse old comments... I just put together CodeYourFuture/trainee-tracker#68 so that we can just run a standalone binary to close existing comments - if we add <!--CYFTT tag: sdc-test-results--> somewhere in the comment we leave, we can use that binary to minimise past comments. WDYT?

[LonMcGregor]

I think I've got it working now. I've tested a fork in my repo and it seems to be working well. But because the action setup is tricky I won't know if it actually fully works until it's merged and I can do a full run through of solving a task using a fork from this repo. One thing I'm not sure of is how this is going to impact people who have already forked this repo - when they submit, it should skip past any irrelevant tasks, but for the handful that still haven't submitted these early tasks it might cause a problem because their repo won't have the right files in it.