Introduce Async/Task-based calls for the Operations

[baronfel]

Description

The current version of the SwaggerProvider only exposes synchronous network calls. It would be excellent if we had Async or Task-based versions as well, for throughput reasons.
I don't know which representation (Async or Task) would be best, especially because the operations from this library are often consumed by C# code.

Repro steps

Expected behavior

Asyncronous versions of the operations would be made available.

Actual behavior

Only synchronous versions of operations are present.

Known workarounds

You can manually manage Tasks/Asyncs of synchronous operations via the old-style BackgroundWorker/IAsyncResult mechanisms if you so wish.

Related information

[7sharp9]

I would say asynchronous calls is a must, I would not expect any calls to be synchronous. In terms of Task/Async I would say support both, use a param on the TP to generate the non default one.

[sergey-tihon]

Released in v0.10.0-alpha9 thanks to @baronfel !