[Component] InputText Component for Storybook docs

TODO:

[x] Move the InputText component from coop-ds-storybook to this repo, under the react-ui package
[x] Remove the pcss imports from jsx
[x] Remove the pcss file from component directory
[x] Have component styles installed at react-ui package root level as a package dependency
[x] Import component style .pcss at a global level in .storybook/preview.js
[x] Have stories attached to the component that cover all states of the component
[x] Add tests for the component using jest and testing-library/react
[x] Remove any static html examples from component directory
[x] Avoid any state management work for the time being, if it can be avoided.

coopdigital / coop-frontend