Knip 8: remove unused exports

[handeyeco]

Summary:

Knip identified these as both unused internally and not exported through our main export files, but please double check!

As far as I can tell, a lot of this was copy/pasted from Webapp where there are duplicate declarations there.

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/rotten-turkeys-pump.md, testing/wait.ts, packages/perseus/src/sigfigs.ts, packages/perseus/src/multi-items/prop-type-builders.ts, packages/perseus-linter/src/rules/lint-utils.ts, packages/math-input/src/components/aphrodite-css-transition-group/util.ts, packages/math-input/src/components/tabbar/item.tsx, packages/perseus/src/widgets/numeric-input/numeric-input.testdata.ts, packages/perseus/src/widgets/interactive-graphs/graphs/use-transform.ts

---

Don't want to be involved in this pull request? Comment #removeme and we won't notify you of further changes.

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (ab79ced) and published it to npm. You
can install it using the tag PR1778.

Example:

yarn add @khanacademy/perseus@PR1778

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

./dev/tools/bump_perseus_version.sh -t PR1778

[github-actions]

Size Change: +349 B (+0.04%)

Total Size: 867 kB

Filename	Size	Change
packages/perseus/dist/es/index.js	420 kB	+349 B (+0.08%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.8 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	78 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-editor/dist/es/index.js	281 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/strings.js	3.4 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[benchristel]

LGTM!