Request review of observable:hashes for potential removal from UCO

[vulnmaster]

Bug description

In a discussion on 1/3/2025 between @vulnmaster and @ajnelson-nist, there is some concern that observable:hashes is not needed in the Unified Cyber Ontology as we already have observable:hash

This was in discussion to @vulnmaster building a converter script that converts NIST's NSRL CAID ODATA format to UCO.

We shouldn't need observable:hashes as we can capture multiple hashes in a file facet like this as of UCO v1.4.

{
  "@context": {
    "odata.metadata": "http://github.com/ICMEC/ProjectVic/DataModels/1.2.xml#Media",
    "uco-observable": "https://ontology.unifiedcyberontology.org/uco/observable/",
    "uco-types": "https://ontology.unifiedcyberontology.org/uco/types/",
    "uco-core": "https://ontology.unifiedcyberontology.org/uco/core/",
    "uco-vocabulary": "https://ontology.unifiedcyberontology.org/vocabulary/",
    "kb": "http://example.org/kb/",
    "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
    "xsd": "http://www.w3.org/2001/XMLSchema#"
  },
  "@graph": [
    {
      "@id": "kb:media-d2d4a2f7-2cea-4b8f-9a72-7df02cc17e6c",
      "@type": "uco-observable:File",
      "categories": 8,
      "facets": [
        {
          "@type": "uco-observable:FileFacet",
          "observable:sizeInBytes": 488,
          "observable:fileName": "build2.art",
          "observable:filePath": "Like a Dragon Gaiden- The Man Who Erased His Name/Content/runtime/media/ylad8/data/artisan",
          "observable:hash": [
            {
              "@type": "uco-types:Hash",
              "types:hashMethod": "MD5",
              "types:hashValue": "588cd1c0e48916d8e7403310402d0a68"
            },
            {
              "@type": "uco-types:Hash",
              "types:hashMethod": "SHA1",
              "types:hashValue": "e65706b487c73e992bab2a50707a9fd8b0bd6866"
            }
          ]
        }
      ]
    }
  ]
}

Suggest review for removal of the property observable:hashes

@ajnelson-nist feel free to add to this in the event that I misinterpreted your thoughts on this.