Add File URI as search result option for Strawberryflavor search endpoint

[DiegoPino]

See #234
This will also pass a new structure around for the format_strawberryfield work on allowing search to be postprocessed via Metadata Displays and Exposed Metadata Display entities.

Requires (if you want to have a fast service) to add this to your Solr Index, Strawberry Flavor data source

The returned JSON structure for a search e.g for an ADO with UUID d7ea33a0-1211-4f05-b733-e4ede4e57624 to the base search path
http://localhost:8001/do/d7ea33a0-1211-4f05-b733-e4ede4e57624/flavorsearch/all/ocr/?q=queen
could be:

{
  "matches": [
    {
      "par": [
        {
          "page": 20,
          "boxes": [
            {
              "l": 0.546,
              "t": 0.148,
              "r": 0.568,
              "b": 0.158,
              "page": 0
            },
            {
              "l": 0.546,
              "t": 0.161,
              "r": 0.568,
              "b": 0.171,
              "page": 0
            },
            {
              "l": 0.389,
              "t": 0.421,
              "r": 0.411,
              "b": 0.431,
              "page": 0
            },
            {
              "l": 0.161,
              "t": 0.347,
              "r": 0.183,
              "b": 0.357,
              "page": 0
            }
          ]
        }
      ],
      "text": "ble metal, lead, copper, glass, wood, paper, &c, 180. {{{Queen}}} Elizabeth, 9. {{{Queen}}} Victoria’s patronage of art, xir; etching, 25; 1,500 proofs(!) of Her portrait, 96; a single impression of a ... ““ Proofs,”” Retouching,” ¢ Publishing,” dis- tinctive titles of ““proofs,” 195; 1,500 proofs (1) of Her Majesty {{{Queen}}} Victoria, 196 ; Rembrandt’s retouchings, 197; poor Miiller and the publisher, fraudulent ... Portraits, fictitious ones, 1x. Poikilographia, 14. Portraits, {{{Queen}}} Elizabeth’s, 9. Portraits, the first printed in England, 9; the first collector of, 15.",
      "sbf_metadata": {
        "sequence_id": "1",
        "file_uuid": "8b7db990-bd5b-4e54-9453-a97cfcd83cd6",
        "sbf_file_uri": "s3://ec1/image-art-exemplar-021-8b7db990-bd5b-4e54-9453-a97cfcd83cd6.jp2"
      }
    },
    {
      "par": [
        {
          "page": 21,
          "boxes": [
            {
              "l": 0.304,
              "t": 0.438,
              "r": 0.32599998,
              "b": 0.44799998,
              "page": 14
            }
          ]
        }
      ],
      "text": "mathematical combinations, the most ex- tensive printing office, 119; William 1V., {{{Queen}}} Victoria, Prince Frederick Wil- liam a ¢ compositor,” the smallest type ever made, 120.",
      "sbf_metadata": {
        "sequence_id": "1",
        "file_uuid": "7103c037-e9d9-4310-a7dd-43efc6375830",
        "sbf_file_uri": "s3://6a9/image-art-exemplar-019-7103c037-e9d9-4310-a7dd-43efc6375830.jp2"
      }
    }
  ]
}

where sbf_metadata is a new key. Does not affect IABookreader at all (is not even aware). Disclaimer: this result was passed through esmero/format_strawberryfield#252. As you can see the original "sequence_id" was 1 for every of these, but then the Twig templating found inside the IIIF Manifest the right Canvas order and rewrote it to page 20 and page 21. This is great.

[DiegoPino]

Resolved via 266aa68