CMR-10165: Extend sorting capabilities for CMR-STAC collection search

[dmistry1]

Add support for sorting collection results

This PR adds support for sorting collection results by startDate, endDate, id, and title.

Changes

• Updated current implementation of sort to comply with STAC standards
• Implemented sorting functionality in the collection search endpoint
• Added validation for sort fields
• Updated documentation to reflect new sorting capability

Examples

GET Request

http://localhost:3000/stac/LPCLOUD/collections?sortBy=-properties.startDate,id

POST Request

http://localhost:3000/stac/SEDAC/collections

{
    "sortby": [
        {
            "field": "properties.id",
            "direction": "desc"
        }
    ]
}

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.19%. Comparing base (7482b0e) to head (7e9e691).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
+ Coverage   87.88%   88.19%   +0.30%     
==========================================
  Files          23       24       +1     
  Lines        1123     1152      +29     
  Branches      241      250       +9     
==========================================
+ Hits          987     1016      +29     
  Misses        136      136              

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