Describe the bug

Use column count extension to show multiple questions in the same line.

https://build.fhir.org/ig/HL7/sdc/StructureDefinition-sdc-questionnaire-columnCount.html

{
  "resourceType": "Questionnaire",
  "item": [
    {
      "extension": [
        {
          "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-columnCount",
          "valuePositiveInt": 3
        }
      ],
      "linkId": "group-column",
      "type": "group",
      "item": [
        {
          "linkId": "1",
          "type": "string"
        },
        {
          "linkId": "2",
          "type": "integer"
        },
        {
          "linkId": "3",
          "type": "decimal"
        }
      ]
    }
  ]
}

Component
Core library, SDC library, reference app, or SDC gallery app

To Reproduce
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Expected behavior
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