fix: add test case for ios13 z order bug.
The bug is fixed in: https://github.com/ecomfe/zrender/pull/522 IOS13 safari probably has a compositing bug (z order of the canvas and the consequent dom does not act as expected) when some of the parent dom has `-webkit-overflow-scrolling: touch;` and the webpage is longer than one screen and the canvas is not at the top part of the page. Check `https://bugs.webkit.org/show_bug.cgi?id=203681` for more details.
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test/ios13-z-bug.html
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