[issue37006] Add top level await statement support for doctest

[Batuhan Taskaya]

Change by Batuhan Taskaya <batuhanosmantaskaya at gmail.com>:


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nosy: +BTaskaya
versions: +Python 3.9 -Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37006>
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