Add title to component iframes

[spencercanner]

• Add new text options to enable configuration of iframe titles
  • A new text option was not added to the cart since we can use the title text option
• Add new getter to the component class to return the iframe title from the text options
  • The cart class overrides this getter to return the title from the text options
• Update the generic view class to pass through the component's iframeTitle when creating the iframe
• Update the iframe class to add a title attribute to the element if it is provided in the config

To 🎩 :

• Create a buy button where all component are iframes (product, productSet, modal, modalProduct, toggle, cart)
• Navigate a screen reader through the page
• Verify that all iframes are announced with their respective titles
  • Note the cart toggle iframe isn't announced because it is inside a div with an aria-label, but the title can be seen by inspecting the element.

• Safari - Mac - VoiceOver
• Firefox - Windows - NVDA