Fix Stream.ReadExactly CA2022 warning; optimize for stackalloc/arraypool #902

Job	Run time
Test (windows-latest, net472, x64, Release)	2m 22s
Test (windows-latest, net8.0, x64, Release)	3m 12s
Test (windows-latest, net48, x64, Release)	2m 43s
Test (windows-latest, net10.0, x64, Release)	2m 57s
Test (ubuntu-latest, net10.0, x64, Release)	1m 54s
Test (ubuntu-latest, net8.0, x64, Release)	1m 50s
	14m 58s

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