Django-aws-api-gateway-websockets

- Updating the README file with additional examples.
- Adding in additional unit tests to improve coverage from 86% to 96%.
- Adding Django 4.2 into the matrix of tests replacing 4.2a1
- Adding Django 5 into the tox runner

- Adding Django 4.2a1 into the matrix of tests

- Fixing an issue where ApiGatewayAdditionalRoute had a unique constraint on the route_key when it should
have been a composite unique constraint on the api_gateway and the route_key

- Fixing an issue within the dispatch method of the view where the route key was missing from the arg. Now continues
with the checks.

- Corrected the examples of the CSRF and Session values on the README file.

- Added in tests for Python 3.11
- Removed use of CodeCov and moved to use GitHUb actions to store and report on the coverage.
- Actions fail if coverage drops below 85%, this threshold will be increased in the future as I add in additional tests
- Updated requirements and removed legacy tox files
- Updated version of gitHub Actions
- Added link to the PyPi site from the readme