class TaskExtensions should probably be public, not internal

[Dmitry-Me]

Whoever decides to implement a task wait on his own would have to implement a wait loop which goes like this:

 while (true)
{
    if (task.WasFinished)
    {
        //process finished task
       break;
    }
    else
    {
        // see how much time passed and then maybe wait further or maybe panic
   }
}

The problem is the client will have to properly implement WasFinished. Some users will only consider Completed and ProcessingFailed and so their code will hang if a task is deleted or gets into NotEnoughCredits state.

The proper way is to use Abbyy.CloudSdk.V2.Client.Models.TaskExtensions.IsInProcess but TaskExtensions class is internal so it cannot be used by user code.

Perhaps class TaskExtensions shoulb be made public so user code can access it too.