Add async PerformAsync and FlushAsync methods with CancellationToken support #773

Job	Run time
Test (windows-latest, net9.0, x64, Release)	2m 19s
Test (windows-latest, net8.0, x64, Release)	2m 26s
Test (ubuntu-latest, net6.0, x64, Release)	1m 16s
Test (windows-latest, net48, x64, Release)	1m 53s
Test (ubuntu-latest, net8.0, x64, Release)	1m 5s
Test (windows-latest, net472, x64, Release)	1m 53s
Test (windows-latest, net6.0, x64, Release)	2m 45s
Test (ubuntu-latest, net9.0, x64, Release)	1m 19s
	14m 56s

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