Pytest-fluent

- Supporting now Python 3.12
- Changed pytest entrypoint which is now called `fluent` instead of `fluent-logger`

The `additional_information_callback` decorator can now consume optionally a keyword argument `item: pytest.Item`.

- fixes 48

* Setting a custom record formatter class for logging is now possible

* Adding more information to the test documents
* Making installation more stable
* Deprecating older Python versions
* Custom stage settings