* Move ValidatedTextInput and ValidationInputError to checkout package
* Include checkout package in tsconfig file
* Remove unnecessary index file
We export these components from packages/checkout/index.js instead
* Import ValidatedTextInput & ValidationInput error from checkout package
* Only add validationError.message when validationError is an object
* Explicitly add undefined to optional props
* Import isObject to test validationError
* Extend the HTML Input element attributes
* Use more performant useDispatch instead of dispatch
* Export component without withInstanceId hoc for testing
* Add tests for ValidatedTextInput
* bot: update checkstyle.xml
* Rename export of unwrapped component to have __
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Thomas Roberts