AsyncTask

Simple mimik of async/await for those come from C# world, so you don't need to dealing with waitGroup/channel in golang.

also the result is strongTyped with go generics, no type assertion is needed.

few chaining method provided:

• ContinueWith: send task1's output to task2 as input, return reference to task2.
• AfterBoth : send output of taskA, taskB to taskC as input, return reference to taskC.
• WaitAll: all of the task have to finish to end the wait (with an option to fail early if any task failed)
• WaitAny: any of the task finish would end the wait

    // start task
    task := asynctask.Start(ctx, countingTask)
    
    // do something else
    somethingelse()
    
    // get the result
    rawResult, err := task.Wait()
    // or
    task.Cancel()

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