Add support to cy.type() for "typing into document"

[chrisbreiding]

Allowing the document to be the subject when using cy.type() will allow typing that doesn't need a text field (namely, keyboard shortcut capturing) to be tested. So a user can write the following test, for example:

// for this example, assume there's a listener on `document` that
// opens a modal when 'abcd' is typed
cy
  .document().type('abcd')
  .get('.modal').should('have.text', 'A modal!');

[brian-mann]

Fixed in 0.17.1.

You can achieve this by typing into the body.

cy.get("body").type("{ctrl}s")