Feature request: add option to get facet values in original case (capitalisation)

[nickynicolson]

Currently all values are transformed to lowercase before faceting. I am working with recordedBy and need original case.

Example:
https://api.gbif.org/v1/occurrence/search?dataset_key=cd6e21c8-9e8a-493a-8a76-fbf7862069e5&facet=recordedBy&limit=0

{
  "offset": 0,
  "limit": 0,
  "endOfRecords": false,
  "count": 3513561,
  "results": [
    
  ],
  "facets": [
    {
      "field": "RECORDED_BY",
      "counts": [
        {
          "name": "s.coll.",
          "count": 285535
        },
        {
          "name": "kerr, a.f.g.",
          "count": 15672
        },
        {
          "name": "furuse, m.",
          "count": 12496
        },
        {
          "name": "wallich, n.",
          "count": 10804
        },
        {
          "name": "gamble, j.s.",
          "count": 10540
        }
      ]
    }
  ]
}