Offer JavaScript support for built-in colorways or scales defined by name

It would be convenient not to have to manually define the colorway or scales for certain plots, such as bubble plots, with an array of colors. I'd like to specify it via import or string, for example:

layout = {
              xaxis: {
                range: ...
              },
              yaxis: {
                range: ...
              },
              title: 'My plot',
              colorway: ['#f3cec9', '#e7a4b6', '#cd7eaf', '#a262a9', '#6f4d96', '#3d3b72', '#182844'], // Here is where I'd like to just specify a theme basically
           }

issue 中没有指定文件或测试。首先在 repository 中搜索 colorway 处理和 plot 布局配置，然后查看内置 scale 或 theme 可以如何命名或导入。完成标准是：plot 可以按名称或通过导入选择内置 colorway 或 scale，而不必手动提供数组。