Add a way that allows submit form by enter

[wKich]

react-admin project has a test where they check submit a form by pressing Enter key https://github.com/marmelab/react-admin/blob/master/cypress/integration/create.js#L132-L162

If I understand right, BigTest doesn't have any similar action.

PS calling the submit method of form leads to unexpected result without creating a post, just reload the page with query params in url.