Grouped Stacked Bars for Timeline (Range Bar) Chart

[jovanadimovska]

Summary

I would like to have the possibility to have grouped stacked bars for Range Bar chart, as it is already possible for the regular bar chart. Adding the group property should have the same effect as it does for the Bar chart.

API Changes

series: [
  {
    name: 'Bob',
    data: [
      {
        x: 'Design',
        group: 'phase1',
        y: [
          new Date('2019-03-05').getTime(),
          new Date('2019-03-08').getTime()
        ],
        
      }
    ]
  }, ...
]

Intended Use Case

I have a timeline chart where I have many series that I need to fit in one category. Some of them are overlapping and others are not. If I stack them all, I lose information. If I have them all in separate ranges, the row becomes too big.
Ideally, I would split them and have 2-3 groups.
Also it should be possible to not have equal number of bars for each category.

[github-actions]

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