Support optionExclusive extension in questionnaires

[jingtang10]

Is your feature request related to a problem? Please describe.
See
http://hl7.org/fhir/R4/extension-questionnaire-optionexclusive.html

and http://build.fhir.org/ig/HL7/sdc/behavior.html#choice-restriction

Basically if an answer option has this extension, selecting this answer option means other answer options need to be deselected.

Describe the solution you'd like
This needs to be implemented in the checkbox group first. and all other widgets that support repeated answers.

Describe alternatives you've considered
NA

Additional context
NA

Would you like to work on the issue?
no thanks

[santosh-pingle]

I am working on implementation.

[jingtang10]

@soura-b fyi

[santosh-pingle]

As per discussion with @jingtang10 @fredhersch in android fhir sdk developers call
If you reselect an option, then clear the optionExclusive selection

[santosh-pingle]

questionnaire json with optionExclusive extension for example purpose only.

{
  "title": "Multiple choice",
  "status": "active",
  "version": "0.0.1",
  "resourceType": "Questionnaire",
  "item": [
    {
      "linkId": "1.0.0",
      "text": "Do you have any of the following symptoms?",
      "type": "choice",
      "repeats": true,
      "extension": [
        {
          "url": "http://hl7.org/fhir/StructureDefinition/questionnaire-itemControl",
          "valueCodeableConcept": {
            "coding": [
              {
                "system": "http://hl7.org/fhir/questionnaire-item-control",
                "code": "check-box",
                "display": "Checkbox"
              }
            ],
            "text": "Checkbox"
          }
        }
      ],
      "answerOption": [
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/StructureDefinition/questionnaire-optionExclusive",
              "valueBoolean": true
            }
          ],
          "valueCoding": {
            "code": "code_1",
            "display": "Missed period",
            "system": "http://snomed.info/sct"
          }
        },
        {
          "valueCoding": {
            "code": "code_2",
            "display": "Tender, swollen breasts",
            "system": "http://snomed.info/sct"
          }
        },
        {
          "valueCoding": {
            "code": "code_3",
            "display": "Nausea",
            "system": "http://snomed.info/sct"
          }
        },
        {
          "valueCoding": {
            "code": "code_4",
            "display": "Vomiting",
            "system": "http://snomed.info/sct"
          }
        },
        {
          "valueCoding": {
            "code": "code_5",
            "display": "Increased urination",
            "system": "http://snomed.info/sct"
          }
        },
        {
          "valueCoding": {
            "code": "code_6",
            "display": "Fatigue",
            "system": "http://snomed.info/sct"
          }
        }
      ],
      "item": [
        {
          "linkId": "1-select-one",
          "text": "Check all that apply",
          "type": "display"
        }
      ]
    }
  ]
}