echarts provider testing

echarts test.dash.yaml

datasets:
- uuid: pop
  url: /datasets/population.json
pages:
- components:
    - settings:
        component: echarts
        echarts:
            option: >-
                    {
                        "toolbox": {
                            "feature": {
                                "dataZoom": {},
                                "magicType": {
                                    "type": ["line", "bar", "stack"]
                                },
                                "restore": {}
                            }   
                        },
                        "series": [
           
                            { 
                                "type": "bar",
                                "markPoint": {
                                    "data": [
                                        { 
                                          "type": "max", 
                                          "symbol": "arrow",
                                          "symbolRotate": 180
                                        }
                                    ]
                                },
                                "markLine": {
                                    "data": [
                                        { "type": "average" },
                                        { "type": "max" },
                                        { "type": "min" }
                                    ]
                                }
                            }
                        ]
                        
                    }
            title:
                text: Population
        external:
          width: 100%
          height: 600px
        dataSetLookup:
          uuid: pop
          
          group:
            - columnGroup:
                source: Name
              groupFunctions:
                - source: Name
                #- source: 2020 Population
                - source: 2021 Population