fix(sankey): fix dragger bug for sankey when series data key name is nodes

[DuLinRain]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

fix dragger bug for sankey when series data key name is nodes。

in the no fixed version, when series data key name is "nodes"（which is supported according to official docs）, the draggable effect is only applied to nodes, and the node is splited from edges

Fixed issues

fix dragger bug for sankey when series data key name is nodes。

Details

when series data key name is "nodes"（which is supported according to official docs）, the draggable effect is only applied to nodes, and the node is splited from edges

Before: What was the problem?

in the no fixed version, when series data key name is "nodes"（which is supported according to official docs）, the draggable effect is only applied to nodes, and the node is splited from edges

After: How is it fixed in this PR?

    const nodes = this.option.data || this.option.nodes;        
    const dataItem = nodes[dataIndex];

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

[echarts-bot]

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[echarts-bot]

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