[I] problems with Contour Chart [echarts-custom-series]

["helgasoft (via GitHub)" <gi...@apache.org>]

helgasoft opened a new issue, #16:
URL: https://github.com/apache/echarts-custom-series/issues/16

   Contour chart is [defined](https://github.com/apache/echarts-custom-series/tree/main/custom-series/contour) as _"connecting points of equal value (e.g., elevation or intensity) with contour lines"_.
   But it looks like it's in fact a **density** (also called heatmap) chart.  Library _d3_ is used to draw areas around adjacent points.
   [This example](https://codepen.io/helgasoft/pen/bNVjEVy) shows several issues with current code:
   * chart is not positioned correctly on X and Y axes, or axes are incorrectly drawn
   * encode is defective for axes and tooltip
   * dataZoom has problems with all _filterMode_ options
   * tooltip shows the same value everywhere, it is the last value from data
   * ```appendData``` does not work, maybe in general for all custom types (?)
   
   Contours were discussed in [#13909](https://github.com/apache/echarts/issues/13909), and I said that _"contours are already feasible in ECharts with series type 'line' or 'custom-polygon'"_.
   Maybe just rename this one from "contour" to "density chart" ?
   
   PS:  the heatmap chart with ```coordinateSystem:'geo'``` displays similar density effect - [example](https://codepen.io/helgasoft/pen/GRGqZeR).


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