fix(sunburst): radius in levels

[Ovilia]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Some sunburst examples uses series.levels.r and series.levels.r0 but this option is not exposed in the document. After further examination, we found the original implementation supports series.data.r but we don't find the necessary scenario for this by now. And radius typed in number | number[] may be a better option name than r and r0 to be consistent with Pie series.

So this PR fixes this problem and exposes series.levels.radius to developers.

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

Tested and passed all sunburst* cases.

Others

Merging options

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

Other information

[echarts-bot]

Thanks for your contribution!
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The pull request is marked to be PR: author is committer because you are a committer of this project.

Document changes are required in this PR. Please also make a PR to apache/echarts-doc for document changes and update the issue id in the PR description. When the doc PR is merged, the maintainers will remove the PR: awaiting doc label.

[echarts-bot]

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