Start moving some utils out of Perseus

[handeyeco]

Summary:

One of a few PRs where I'll be moving utils we need on the server out of perseus and into perseus-core

Issue: LEMS-2737

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (eeb12cb) and published it to npm. You
can install it using the tag PR2088.

Example:

yarn add @khanacademy/perseus@PR2088

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR2088

[github-actions]

Size Change: +18.6 kB (+1.29%)

Total Size: 1.47 MB

Filename	Size	Change
packages/perseus-core/dist/es/index.js	23 kB	+19 kB (+473.29%)	🆘
packages/perseus/dist/es/index.js	410 kB	-329 B (-0.08%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	39 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	83.1 kB
packages/math-input/dist/es/index.js	78 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-editor/dist/es/index.js	688 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus-score/dist/es/index.js	103 kB
packages/perseus/dist/es/strings.js	4.82 kB
packages/pure-markdown/dist/es/index.js	3.67 kB
packages/simple-markdown/dist/es/index.js	12.5 kB

_{compressed-size-action}

[jeremywiebe]

I'm not certain we want to move this into Perseus-core. It's only used in tests. Also, if we want to do this move, I'd want to see if we can consolidate all the different ways we clone (today, we have this clone, then we have deepClone(), another clone(), and _.clone(): all of which look to do very similar things).

[handeyeco]

This was a total mistake from me being on auto-pilot. Thanks for catching it.

[handeyeco]

The parent pull-request (#2086) has been merged into main, but this branch (LEMS-2737-2/utils) now has conflicts with the new base branch. These conflicts must be resolved before checks can complete on this pull-request.