chore: remove lodash

[JoshuaKGoldberg]

Fixes #2279.

There are actually two functions from lodash being used today:

memoize is, IMO, a nice little thing to have. Since it doesn't use regular expressions the way the parts of lodash that sometimes get CVEs do, I figured we could keep it.

unescape is the direct part of an unescapeStringLiteralText that actually does fail unit tests when removed: https://github.com/typescript-eslint/typescript-eslint/pull/2517/checks?check_run_id=1083789433.

-  "value": "&",
+  "value": "&",

IMO there's still benefit to the "lodash ideology" of using the same stable functions & high quality docs across projects -- and unescape is itself also pretty stable.

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

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[JoshuaKGoldberg]

Hmm, I'm starting to have doubts about the benefits of removing lodash entirely. I'll post in the issue.