[issue37006] Add top level await statement support for doctest

[Matthias Bussonnier]

Matthias Bussonnier <bussonniermatthias at gmail.com> added the comment:

As a reference, PR from Yuri for an asyncREPL  `python -m asyncio` which I believe he want in 3.8:

https://github.com/python/cpython/pull/13472

I'm also likely to align IPython behavior on whatever core python decides.

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