Add asyncio bootstrapper decorator

[Yann Kaiser]

The decorator would allow the use of async functions by running them using loop.run_until_complete. This should be implemented in a way that doesn't prevent execution if asyncio isn't present. (import within the decorator will do)

[Jesús Leganés-Combarro]

Any update on this?

[Jesús Leganés-Combarro]

Myself i'm using asyncio.run(), that's a higher level API. I think that's the one we should be using here.