Add async PerformAsync and FlushAsync methods with CancellationToken support #824

Job	Run time
Test (windows-latest, net472, x64, Release)	3m 31s
Test (windows-latest, net6.0, x64, Release)	5m 8s
Test (ubuntu-latest, net9.0, x64, Release)	1m 49s
Test (ubuntu-latest, net8.0, x64, Release)	2m 0s
Test (windows-latest, net8.0, x64, Release)	3m 42s
Test (windows-latest, net48, x64, Release)	4m 33s
Test (windows-latest, net9.0, x64, Release)	5m 30s
Test (ubuntu-latest, net6.0, x64, Release)	1m 42s
	27m 55s

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