显示桑基图每列的名称
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new-feature
- Dominant language
- TypeScript
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Description
### What problem does this feature solve?
显示桑基图每列的名称。例如桑基图有三列，注册， 认证，活跃，每一列都有自己的nodes，怎么在每列下方显示对应的列名。
### What does the proposed API look like?
在levels中增加一个label属性，设置该列的名称
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