fix: svg circle rebuilder

[Aaron0502]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

When the rendering engine is svg, and the canvas height is very high, the radius of the circle is relatively small, and the circle at the bottom cannot be drawn even though there is a drawing path.Fixed bug by changing how circles are drawn.

Fixed issues

null

Details

codesandbox demo: https://codesandbox.io/s/zrender-svg-rebuilder-bug-uuwics?file=/src/App.js
related question: https://stackoverflow.com/questions/5737975/circle-drawing-with-svgs-arc-path
related article: https://www.smashingmagazine.com/2019/03/svg-circle-decomposition-paths/

Others

因为自己所面临的场景有限，提供的解决办法，可能有很大的局限性。作为echarts的忠实用户，期待能得到官方的回应，给我一次学习和交流的机会

[Ovilia]

After running visual tests, I found all circle shapes have slight differences like this.

They are not noticable by human eyes. Is this acceptable? @pissang