Add support for the 'sort' query string parameter in GET searches

[bmquinn]

Steps to test:

• Index some works
• Perform a GET search with the sort query string parameter, e.g.
  https://[YOUR ENVIRONMENT]/search?sort=create_date:desc,accession_number:desc
• Switch the sort direction to see the results change order
  Note: ElasticSearch only supports sorting keyword fields so you'll get errors if you try to sort a text field such as title

[mbklein]

These changes warrant updates to docs/spec/types.yaml and docs/spec/openapi.yaml to add the sort parameter to the Swagger docs. That could be a separate PR, but it's probably good to get into the habit of submitting doc/spec changes at the same time as route/parameter changes.

[mbklein]

👍👍👍

$ curl "http://localhost:3000/collections?sort=modified_date:desc&size=2"

{
  "data": [
    {
      "admin_email": null,
      "api_link": "https://dcapi.rdc-staging.library.northwestern.edu/collections/bfeeb065-5b12-4b10-9883-f32b133c7cd1",
      "api_model": "Collection",
      "create_date": "2021-03-12T02:11:32.342977Z",
      "description": "These images were from the Slide Library which was once in the Visual Media Center under the Department of Art History at Northwestern University.",
      "featured": null,
      "finding_aid_url": null,
      "id": "bfeeb065-5b12-4b10-9883-f32b133c7cd1",
      "indexed_at": "2022-10-26T19:36:05.609672",
      "keywords": [],
      "modified_date": "2022-10-05T16:06:53.193250Z",
      "published": true,
      "representative_image": {
        "url": "https://iiif.dev.rdc.library.northwestern.edu/iiif/2/mbk-dev/fc265314-0006-42e6-bbb3-f4d74f57c21a",
        "work_id": "21991c2b-0e79-4705-9f66-a929d8919329"
      },
      "title": "Department of Art History || Slide Collection",
      "visibility": "Institution"
    },
    {
      "admin_email": null,
      "api_link": "https://dcapi.rdc-staging.library.northwestern.edu/collections/85af945f-1396-4b88-9087-c4f2fa64d21c",
      "api_model": "Collection",
      "create_date": "2021-03-12T02:11:32.427741Z",
      "description": "Rob Linrothe is an Associate Professor in the Department of Art History at Northwestern University. Here he shares his images of Tibetan, Chinese, and Indian monuments, field photography, and architecture. The collection has a strong focus on Tibetan sites, particularly petroglyphs, stupas, and monasteries in the Ladakh and Zangskar regions. Linrothe has also photographed the architecture and sculpture of monuments such as Borobudur in Indonesia and Sanchi in India. Rob Linrothe specializes in Buddhist art of the Himalayas. His recent fieldwork has focused on pre-modern mural painting in the Ladakh and Zangskar regions of Western Tibet (northwest India), as well as the contemporary revival of monastic painting in the Amdo province of Eastern Tibet (China).",
      "featured": null,
      "finding_aid_url": null,
      "id": "85af945f-1396-4b88-9087-c4f2fa64d21c",
      "indexed_at": "2022-10-26T19:36:05.607758",
      "keywords": [
        "photography"
      ],
      "modified_date": "2022-09-28T17:16:14.373640Z",
      "published": true,
      "representative_image": {
        "url": "https://iiif.dev.rdc.library.northwestern.edu/iiif/2/mbk-dev/4d899ca7-a0df-497a-b1e1-8f8749995993",
        "work_id": "b61d3148-79d1-4e3e-9aa2-625ef9a0e5c7"
      },
      "title": "Rob Linrothe Image Collection",
      "visibility": "Public"
    }
  ],
  "pagination": {
    "query_url": "http://localhost:3000/collections?sort=modified_date%3Adesc&size=2",
    "current_page": 1,
    "limit": "2",
    "offset": 0,
    "total_hits": 71,
    "total_pages": 36,
    "next_url": "http://localhost:3000/collections?sort=modified_date%3Adesc&size=2&page=2"
  },
  "info": {}
}

$ curl "http://localhost:3000/collections?sort=modified_date:asc&size=2"

{
  "data": [
    {
      "admin_email": null,
      "api_link": "https://dcapi.rdc-staging.library.northwestern.edu/collections/bc3a6195-e429-4378-958d-b88bce731d03",
      "api_model": "Collection",
      "create_date": "2021-03-12T02:11:32.290932Z",
      "description": "Items awaiting copyright review determinations.",
      "featured": null,
      "finding_aid_url": null,
      "id": "bc3a6195-e429-4378-958d-b88bce731d03",
      "indexed_at": "2022-10-26T19:36:05.582389",
      "keywords": [],
      "modified_date": "2021-03-17T20:18:35.644274Z",
      "published": true,
      "representative_image": {},
      "title": "BFMF Copyright Review",
      "visibility": "Private"
    },
    {
      "admin_email": null,
      "api_link": "https://dcapi.rdc-staging.library.northwestern.edu/collections/17a5d121-2bc2-4942-aa48-34ac86f3b83d",
      "api_model": "Collection",
      "create_date": "2021-03-12T02:11:32.319999Z",
      "description": "University Theatre Production Photographs consists of slides dating from 1953 to 1991, with the bulk of the slides dating from 1971 to 1991. Slides are grouped by production title and arranged chronologically by production date. The distinction has been maintained between slides received directly from Michael Ryzcek and from Jean Deven, so there are two chronological runs of slides.",
      "featured": null,
      "finding_aid_url": null,
      "id": "17a5d121-2bc2-4942-aa48-34ac86f3b83d",
      "indexed_at": "2022-10-26T19:36:05.582654",
      "keywords": [],
      "modified_date": "2021-03-17T20:18:35.644274Z",
      "published": true,
      "representative_image": {},
      "title": "University Theatre Production Photographs",
      "visibility": "Institution"
    }
  ],
  "pagination": {
    "query_url": "http://localhost:3000/collections?sort=modified_date%3Aasc&size=2",
    "current_page": 1,
    "limit": "2",
    "offset": 0,
    "total_hits": 71,
    "total_pages": 36,
    "next_url": "http://localhost:3000/collections?sort=modified_date%3Aasc&size=2&page=2"
  },
  "info": {}
}