Support embedding IPython kernel in async applications

[Jackenmen]

It seems like embedded IPython kernel is already running asynchronously with Tornado, so I am wondering if it would be possible to make embedded IPython support async natively. Currently, IPython.embed_kernel() also runs the loop itself (as well as closes it after exiting the kernel), which doesn't make it possible to embed in async applications and it would seem fitting considering that with asyncio's concurrency one could possibly run embedded IPython kernel without "hanging" the rest of application.
I have no idea how much work that would in reality require though, I just think that such functionality would be useful.