CI check for Unity 2020.3.x, 2021.3.x, 2022.3.x

Added documents for migration to URP/HDRP, and fixed the incorrect depth pixel values in Depth Camera #171

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Run time

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Job	Run time
Test on Unity 2020.3.48f1	49s
Test on Unity 2021.3.42f1	48s
Test on Unity 2022.3.42f1	47s
	2m 24s