Add async PerformAsync and FlushAsync methods with CancellationToken support #820

Job	Run time
Test (windows-latest, net8.0, x64, Release)	2m 49s
Test (windows-latest, net472, x64, Release)	2m 39s
Test (ubuntu-latest, net8.0, x64, Release)	1m 47s
Test (windows-latest, net48, x64, Release)	2m 47s
Test (ubuntu-latest, net6.0, x64, Release)	1m 55s
Test (windows-latest, net9.0, x64, Release)	2m 28s
Test (ubuntu-latest, net9.0, x64, Release)	1m 50s
Test (windows-latest, net6.0, x64, Release)	3m 1s
	19m 16s

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