Add async PerformAsync and FlushAsync methods with CancellationToken support #835

Job	Run time
Test (windows-latest, net6.0, x64, Release)	2m 20s
Test (windows-latest, net8.0, x64, Release)	3m 48s
Test (windows-latest, net9.0, x64, Release)	2m 21s
Test (windows-latest, net472, x64, Release)	2m 4s
Test (windows-latest, net48, x64, Release)	2m 11s
Test (ubuntu-latest, net9.0, x64, Release)	1m 18s
Test (ubuntu-latest, net6.0, x64, Release)	1m 14s
Test (ubuntu-latest, net8.0, x64, Release)	1m 33s
	16m 49s

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