Add new fields to JIM dataset: `representation`, `representation.chartType`, `description, facets.*.measure`, `facets.*.units`, `facets.*.multiplier`

[shepazu]

• representation: object for aspects of the representation
• chartType: in representation, the type of chart, such as bar, line, etc. TBD for complete list or further refinements like how to declare stacked bar or grouped bar
• description: a text description of the chart
• facets.*.measure: in any given facet, what the scale of measure for that facet is; possible values are: nominal, ordinal, interval, or ratio
• facets.*.units: the type of thing being measured; TBD if this is a formal list, or more colloquial
• facets.*.multiplier: the multiplier for the value, e.g. 1000 for "(in thousands)", 1000000 for "(in millions)"

Here's some sample JIM for reference:

{
  "dataset": [
    {
      "title": "Satisfaction Level",
      "subtitle": "Results of user survey",
      "source": {
        "url": "https://example.com",
        "name": "Example source"
      },
      "representation": {
        "chartType": "bar"
      },
      "description": "add line description here",
      "facets": {
        "x": {
          "label": "Satisfaction scores",
          "variableType": "independent",
          "measure": "ordinal"
        },
        "y": {
          "label": "Number of respondants",
          "variableType": "dependent",
          "measure": "ratio",
          "units": "integer",
          "multiplier": "1"
        }
      },
      "series": []
    }
  ]
}

[shepazu]

Add more details about the chartType strings, and the measure key.