refactor(typescript): add TextInputSkeleton types

[davesteinberg]

Closes #12562

Convert TextInputSkeleton to TypeScript.

Changelog

Changed

• TextInput.Skeleton.js converted to tsx, types defined
• .all-contributorsrc and README.md updated (I'm new!)

Testing / Reviewing

• Run yarn build; yarn storybook in packages/react. Confirm that the TextInput > Skeleton story works as expected.
• Add a TextInputSkeleton element to bottom of TextInput.Skeleton.tsx and confirm no type errors. Add a prop with an invalid value and confirm the error is reported.

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[davesteinberg]

I have read the DCO document and I hereby sign the DCO.

[francinelucca]

LGTM 🚀. thanks @davesteinberg !