Fix naming of transformation functions like `Nap` and `Then` when handling `Task` or `ValueTask` as a result of the transformation. If the transformation function supplied to the `Map` or `Then` function returns a `Task` or `ValueTask`, now these functions always have the `Async` suffix in their name.
If the function is an extension function which operates on a `Task<Result<T>>` or `ValueTask<Result<T>>` and does not fulfil the contracts with the task result of the transformation, the function does **not** have the `Async` suffix.
