feat(pie): support specifying coordinate system for pie series.

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

1. Add coordinate system support for pie series.
2. BMap extension supports convertToPixel & convertFromPixel API.

Fixed issues

• 百度地图 作为底图时经纬度坐标转换为像素坐标，目前的echarts实例convertToPixel 方法不管用 #13851
• 地图展示ecahrt 饼图，饼图位置一直在地图左上角 plainheart/echarts-extension-amap#38

Details

Before: What was the problem?

It's not convenient and not direct to display the pie series on Geo/BMap/AMap/Calendar coordinate system.

After: How is it fixed in this PR?

Add a new option coordinateSystem for pie series.

Preview

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

Please refer to test/pie-coordinate-system.html

Others

Merging options

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

Other information

[echarts-bot]

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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.

[Ovilia]

LGTM. This looks very promising! 💐

[plainheart]

@Ovilia @pissang Is this feature planned in v5.3.3 or v5.4?

[pissang]

This feature deserved to be introduced as an important feature in the 5.4 article. But I also can't wait to have it in our next version. @plainheart I think I will leave this decision to you:)

[plainheart]

I had planned to release a new version of the amap extension for this feature in response to some developers' feedback. But it sounds better to introduce this feature in v5.4 so that the developer can know about it in time. I'm okay to leave it in v5.4. :D

[echarts-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

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[echarts-bot]

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