feat(sankey): `sankey` support `edgeLabel`

[susiwen8]

Brief Information

This pull request is in the type of:

• [ ] bug fixing
• [x] new feature
• [ ] others

What does this PR do?

Fixed issues

• Close #7233
• Close #16600
• Close #12855

Details

Before: What was the problem?

Sankey don't have label on edges

After: How is it fixed in this PR?

Misc

• [x] 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

test/sankey-depth.html

Others

Merging options

• [x] Please squash the commits into a single one when merging.

Other information

[echarts-bot[bot]]

Thanks for your contribution! The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

The pull request is marked to be PR: author is committer because you are a committer of this project.

[susiwen8]

@pissang It's there anything else you need to leave a review for this PR

[susiwen8]

Any more suggestion? @pissang @plainheart

[echarts-bot[bot]]

To reviewers: If this PR is going to be described in the changelog in the future release, please make sure this PR has one of the following labels: PR: doc ready, PR: awaiting doc, PR: doc unchanged

This message is shown because the PR description doesn't contain the document related template.

[susiwen8]

@pissang Any suggestion for this feature?

[Nemecsek]

Waiting for this feature.

[pissang]

Sorry for missing this PR. LGTM now

[echarts-bot[bot]]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍

[Tiramisupxl]

Has this feature release? I set "edgeLabel" in sankey is not work

[plainheart]

@Tiramisupxl Not yet. This feature is included in v5.4.1, which is under the voting process.