Echarts 添加堆叠工具选项

https://echarts.apache.org/en/option.html#toolbox.feature.magicType

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option = {
    toolbox: {
        feature: {
            magicType: {
                type: ['line', 'bar', 'stack']
            }
        }
    },
    series: [
        {
            type: 'bar',
            data: [1, 2, 3, 4, 5, 6, 7]
        },
        {
            type: 'bar',
            data: [2, 3, 4, 5, 6, 7, 8]
        },
        {
            type: 'bar',
            data: [3, 4, 5, 6, 7, 8, 9]
        }
    ]
};

type 为 ‘stack’ 时，会将所有的 bar 类型的 series 堆叠在一起。