* Add Python 3.10 to test suite

* Support Django 4.2, remove Python 3.7 support and add Python 3.11 support

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Co-authored-by: Craig Weber <crgwbr@gmail.com>

Oscar is becoming a more community-owned project. This commit reflects a
few organisational changes taking place.

This reverts ac7e8ee

Now using Napoleon :)

This avoids a pesky autodoc import issue that the debug toolbar creates when it
patches the URL conf.  It was preventing the EventHandler class from
being loaded via autodoc.  This fix solves that issue.

See http://djangosnippets.org/snippets/2533/

Also update testing docs to show spec output.