Start a new SourceTOut, TMat from some resource which can be opened, read and closed. It's similar to UnfoldResourceT, TSource(FuncTSource, FuncTSource, OptionT, ActionTSource) but takes functions that return Tasks instead of plain values. You can use the supervision strategy to handle exceptions for read function or failures of produced Tasks. All exceptions thrown by create or close as well as fails of returned futures will fail the stream. Restart supervision strategy will close and create resource .Default strategy is Stop which means that stream will be terminated on error in read function (or task) by default. You can configure the default dispatcher for this Source by changing the `akka.stream.blocking-io-dispatcher` or set it for a given Source by using CreateDispatcher(String).

public static Source<T, NotUsed> UnfoldResourceAsync<T, TSource>(
	Func<Task<TSource>> create,
	Func<TSource, Task<Option<T>>> read,
	Func<TSource, Task> close
)

static member UnfoldResourceAsync : 
        create : Func<Task<'TSource>> * 
        read : Func<'TSource, Task<Option<'T>>> * 
        close : Func<'TSource, Task> -> Source<'T, NotUsed>