Add async PerformAsync and FlushAsync methods with CancellationToken support #764

Job	Run time
Test (windows-latest, net48, x64, Release)	1m 53s
Test (ubuntu-latest, net8.0, x64, Release)	1m 21s
Test (windows-latest, net8.0, x64, Release)	2m 15s
Test (windows-latest, net472, x64, Release)	2m 11s
Test (windows-latest, net9.0, x64, Release)	2m 22s
Test (ubuntu-latest, net6.0, x64, Release)	1m 31s
Test (windows-latest, net6.0, x64, Release)	2m 23s
Test (ubuntu-latest, net9.0, x64, Release)	1m 22s
	15m 18s

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