Decorators: replace asyncio.Lock with a custom object

Concerns were raised over possible race conditions due `asyncio.Lock`
internally awaiting coroutines. Does a mere `await` suspend the current
coroutine, or does it have to actually await something asynchronous,
like a future?

Avoid answering that question by doing away with the awaits, which
aren't necessary but are there as a consequence of using `asyncio.Lock`.
Instead, add a custom `LockGuard` object to replace the previous locks.

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