feat(legend): use series/data name in legend according to series.colorBy

[Ovilia]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

colorBy was supported in #13788 , enabling using color palettes for each series/data. This PR enhances the legend component so that names of series/data are used in legend items according to colorBy.

Fixed issues

Details

Before: What was the problem?

For bar series colored by data, only the series name is shown in the legend and the color is not representing the data.

After: How is it fixed in this PR?

By default, if the bar series is colored by data, multiple legend items are in the legend component with the name of the data.

Misc

• The API has been changed (apache/echarts-doc#xxx).
• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

NA.

Others

Merging options

• Please squash the commits into a single one when merge.

Other information

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