feat: FSM Builder

[eliotwrobson]

Work-in-progress remake of #6604. Will be incorporating some new features before even taking this out of draft, so no need to review yet. In addition, we almost certainly don't want to merge before the paper for this appears and we can get some feedback from users.

The items to add (so far) are:

• Fix all javascript linting errors on main file for this element.
• Add tests for (most aspects of) the grading algorithm.
• Setting and resetting a non-empty initial configuration. This makes it easy to write questions where students have to fix an incorrect answer.
• Make grading algorithm more efficient by using wall-following on difference DFAs instead of brute-force check.
• Update arXiv version of paper with new installation instructions and changes made to grading algorithms (including proof of partial credit).

[github-actions]

All images

Image	Platform	Old Size	New Size	Change
prairielearn/executor:1d24f64cef8e9e36fa838f4a536eacc4f2dbb660	null	1627.45 MB	1627.84 MB	0.02%
prairielearn/plbase:1d24f64cef8e9e36fa838f4a536eacc4f2dbb660	linux/amd64	1437.84 MB	1438.21 MB	0.03%
prairielearn/prairielearn:1d24f64cef8e9e36fa838f4a536eacc4f2dbb660	linux/amd64	1627.45 MB	1627.84 MB	0.02%