[Development] How to take of QRhiRenderTarget's contents in rendering?

[JiDe Zhang]

Hi, I has a bug report: https://bugreports.qt.io/browse/QTBUG-120519 .

https://github.com/vioken/waylib/blob/dd9bcfe3c5736ea9508ff88c45c583a7427b762e/src/server/qtquick/private/wrenderbuffernode.cpp#L518 is my implementation, it's very ugly. And this is a big job, because not any helper codes for this job in QRhi.

So I want to get some suggests of how to modify QRhi for it, and I want to contribution.
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