Lightbus

* Enhancement: Python 3.10 & 3.11 now supported
* Vendored aioredis due to compatibility issues
* Breaking: Python 3.7 & 3.8 no longer supported

* Updating uses_django_db helper to use django's built-in db connection cleaning up facilities.
This should more closely mirror Django's own internal request-based connection management
* Errors are now reported in a single log message. This should make error logging much more sane.
* Human name is now generated using the `random` builtin rather than `secret`, as this does not need to be crypt-secure
* Event firing sanity checking now correctly respects non-required parameters

* Now correctly creating schemas from custom classes with `property` decorated methods

* Enhancement: Python 3.9 now supported

* Bug: Now showing the welcome message only once
* Enhancement: `TransportPool` now has a sensible `__str__()` implementation, which improves logging
* Bug: Prioritising use of the `__to_bus__()` method in schema creation. This ensures that
schema generation and data deforming are now consistent

* Enhancement: An `EventMessage` is now returned when firing any event.