sync primitives#5848
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Fixes #5845
A recent update made the threading objects instantiate lazily, with cached_property. This was done because in Python3.8 objects like Event are bound to the thread where they are instantiated, and would break if you tried to use them in another thread with a different async loop.
Unfortunately that fix broke the thread safety of post_message. This update forces the async primitives to instantiate in the async task where they are used.
This is a bit of a patch until we drop 3.8 (soon).