[Web - New] Adding cashtab-components source

Summary: Adds source code of published npm package, cashtab-components. Codebase currently available at https://github.com/josephroyking/cashtab-components. NPM module here: https://www.npmjs.com/package/cashtab-components. This was refactored from https://github.com/Bitcoin-com/badger-components-react , adding typescript, upgrading React, and upgrading Storybook. Starting point here because TypeScript refactor of original source code proved more involved than foreseen, more an overhaul than a diff.

Test Plan:

cd web/cashtab-components
npm ci
npm run storybook

Component library will load at localhost:6006 (should open automatically in browser)

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Subscribers: majcosta

Differential Revision: https://reviews.bitcoinabc.org/D9091