Develop: Add search results list view

[mdconatser]

As a user trying to search for a mail piece, I want a list of results to choose from.

See mockups: https://xd.adobe.com/view/db7cd80e-542d-495d-8909-01d4b2607dbe-8e2f/screen/e421e377-e929-4977-bf38-eb51e5b9b2b3

Acceptance Criteria

• View for results is added
• View can handle display of a list of MailPiece objects
• Each MailPiece in the list shows the timestamp, sender, brief ImageText clip.
• Does not include selecting an item to view (#397) or information from the scanned mail (#403).
• Document any relevant content in the Programmer guide (draft thoughts of usage and importantly the "Why")
• Updates SRS and STP (and other docs if necessary)
• Add/Update relevant unit tests