Async InMemoryConnector (testing)

[onlyann]

Successful PR Checklist:

• [x] Tests
  • [ ] (not applicable?)
• [ ] Documentation
  • [x] (not applicable?)

PR label(s):

• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20breaking%20%F0%9F%92%A5
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20feature%20%E2%AD%90%EF%B8%8F
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20bugfix%20%F0%9F%95%B5%EF%B8%8F
• [x] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20miscellaneous%20%F0%9F%91%BE
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20dependencies%20%F0%9F%A4%96
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20documentation%20%F0%9F%93%9A

Context

Today, the only supported type of channel notification is the insertion of a new job.

To support more types of notification (e.g. cancellation), the connector will need to interact with async subscribers. To support awaiting async callbacks, some functions from the InMemoryConnector need to be async themselves.

This is what the change is about. Some tests have been updated to avoid mixing sync and async operations because of nested async_to_sync calls.

[github-actions[bot]]

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
procrastinate
testing.py
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