POC code redo

[anakaren-rojas]

Summary:

Redo of POC code for ZND

Issue: LEMS-2272

Test plan:

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/tidy-suns-wait.md, packages/math-input/src/types.ts, packages/perseus/src/perseus-types.ts, packages/perseus/src/components/math-input.tsx, packages/perseus-editor/src/widgets/expression-editor.tsx, packages/math-input/src/components/keypad/keypad.tsx, packages/math-input/src/components/keypad/mobile-keypad-internals.tsx, packages/math-input/src/components/keypad/shared-keys.tsx, packages/perseus/src/components/__tests__/math-input.test.tsx, packages/perseus/src/widgets/expression/expression.test.tsx, packages/perseus/src/widgets/expression/expression.tsx, packages/perseus-editor/src/widgets/__tests__/expression-editor.test.tsx

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[github-actions]

Size Change: +67 B (+0.01%)

Total Size: 1.29 MB

Filename	Size	Change
packages/math-input/dist/es/index.js	77.9 kB	+46 B (+0.06%)
packages/perseus-editor/dist/es/index.js	697 kB	+8 B (0%)
packages/perseus/dist/es/index.js	425 kB	+13 B (0%)

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	4.27 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/strings.js	3.7 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.5 kB

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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (ad48ffd) and published it to npm. You
can install it using the tag PR1738.

Example:

yarn add @khanacademy/perseus@PR1738

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

./dev/tools/bump_perseus_version.sh -t PR1738

[benchristel]

@anakaren-rojas is this PR still needed? If not, can you close it? :)

[anakaren-rojas]

@benchristel yes, ill create a znd for it this week and then close it out

[anakaren-rojas]

Waiting on playtest and content approval before landing or closing

[anakaren-rojas]

Will have a playtest next week