[Sandbox][Teaser] Add support for multiple call to action (CTA)

[vladbailescu]

Our teaser component should allow adding multiple call-to-action (CTA). Behavior will be controlled via a Call to action(s) checkbox:

• When unchecked
  • A link field will be provided
  • The link will be applied to the image and title of the teaser
  • If the link is an AEM page path the title and description of the teaser will fallback to the page title and description.
• When checked
  • The link field is hidden and instead a multifield control will allow authors to select the CTA link and text
  • No fallback values for title and description in this case.

[vladbailescu]

Changes we added to development branch via:

• https://github.com/Adobe-Marketing-Cloud/aem-core-wcm-components/pull/156 - removing link text and cleanup
• https://github.com/Adobe-Marketing-Cloud/aem-core-wcm-components/pull/172 - updating dialog to support multiple CTAs
• https://github.com/Adobe-Marketing-Cloud/aem-core-wcm-components/pull/179 - implementation and test for multiple CTAs