Add async PerformAsync and FlushAsync methods with CancellationToken support #746

Job	Run time
Test (windows-latest, net48, x64, Release)	3m 7s
Test (ubuntu-latest, net9.0, x64, Release)	1m 7s
Test (windows-latest, net8.0, x64, Release)	2m 1s
Test (windows-latest, net6.0, x64, Release)	3m 1s
Test (ubuntu-latest, net6.0, x64, Release)	1m 12s
Test (windows-latest, net9.0, x64, Release)	2m 9s
Test (windows-latest, net472, x64, Release)	1m 53s
Test (ubuntu-latest, net8.0, x64, Release)	1m 18s
	15m 48s

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