ait: update python token streamin async patterns

[owenpearson]

Fixes bugs with asyncio/coroutine usage in python examples in the AIT docs where coroutines were created but never actually started. this meant that in some cases coroutines were created and then all executed at once using asyncio.gather, and in some cases coroutines weren't started at all. the most common way to create a coroutine and start it immediately is by wrapping the coroutine in a call to asyncio.create_task, so this PR updates all AIT python examples to do that.

I've tested the new examples with standalone python scripts and verified that they work correctly.

AIT-550

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[ttypic]

LGTM