Unable to specify unit option

[mlaletina95]

• Fix type for unitOption it should be an array accordingly to FHIR specification.http://hl7.org/fhir/uv/sdc/behavior.html#unitOption
• Fix value for QuestionQuantity control, it should be https://hl7.org/fhir/r4/datatypes.html#Quantity
• Fix QuestionQuantity controls to handle a list of unitOptions.
  • Keep current behaviour if there is only one unitOption, but also set unit information in the control value
  • Add select that allow to choose a unitOption from the provided list if there are more than one unitOption.
• Add storybook for this control Add quantity control to storybook #291

Example of questionItem:

          - linkId: example
            text: example
            type: quantity
            unitOption:
              - Coding:
                  code: foot
                  system: http://unitsofmeasure.org
                  display: ft
              - Coding:
                  code: inch
                  system: http://unitsofmeasure.org
                  display: in
              - Coding:
                  code: cm
                  system: http://unitsofmeasure.org
                  display: cm

[atuonufure]

resourceType: Questionnaire
item:
  - text: example-1
    type: quantity
    linkId: example-1
    unitOption:
      - code: foot
        system: http://unitsofmeasure.org
        display: ft
      - code: inch
        system: http://unitsofmeasure.org
        display: in
      - code: cm
        system: http://unitsofmeasure.org
        display: cm