Add async PerformAsync and FlushAsync methods with CancellationToken support #775

Job	Run time
Test (windows-latest, net8.0, x64, Release)	2m 8s
Test (ubuntu-latest, net9.0, x64, Release)	1m 48s
Test (windows-latest, net472, x64, Release)	1m 58s
Test (windows-latest, net6.0, x64, Release)	4m 14s
Test (windows-latest, net48, x64, Release)	1m 50s
Test (ubuntu-latest, net6.0, x64, Release)	1m 12s
Test (windows-latest, net9.0, x64, Release)	2m 8s
Test (ubuntu-latest, net8.0, x64, Release)	1m 11s
	16m 29s

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