Khan / perseus / 5894689965

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Add Fraction Keypad View (#667)

## Summary:
Added the fraction keypad view to the new v2 keypad as part of our overhaul of MathInput. This fraction view is used by the following Perseus Widgets:

- InputNumber
- Matrix
- NumberLine
- NumericInput
- Table

I've also updated existing stories to be able to demonstrate this new view. As it turns out, we're not doing anything custom with our numberpad page for the Fraction Keypad, so we can reuse the preexisting page. 

Note: I've settled on the prop name of "fractionsOnly" but I am open to any suggestions on a more descriptive name. I felt "fractionsOnly" was the closest I could get to a balance of being descriptive against the tab props, yet brief. 

## Screenshots:
(Forcing the "IN_NUMERATOR" calculator context in the _Full Mobile MathInput_ Story to show the context button)
![Screenshot 2023-08-15 at 3 43 51 PM](https://github.com/Khan/perseus/assets/12463099/16dc4ca1-a1ba-4cbc-85e6-86ed3678b644)

(No cursor context using _Full Keypad_ Story)
![Screenshot 2023-08-15 at 3 40 34 PM](https://github.com/Khan/perseus/assets/12463099/ffa3ce6c-057a-4146-8d5c-2984098535d5)

(Based on our [Figma Designs](https://www.figma.com/file/2lUPOSbOP8tbW7RLqbBFLh/Expression-Widget?type=design&node-id=4674-87332&mode=design&t=gZTp9zvbYilUKfYa-0))

Issue: LC-1098

## Test plan:
- manual testing
- new stories

Author: SonicScrewdriver

Reviewers: handeyeco, SonicScrewdriver

Required Reviewers:

Approved By: handeyeco, handeyeco

Checks: ✅ finish_coverage, ✅ Publish npm snapshot (ubuntu-latest, 16.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 16.x), ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Cypress Coverage (ubuntu-latest, 16.x), ✅ Check for .changeset file (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ gerald

Pull Request URL: https://github.com/Khan/perseus/pull/667

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