Tursu

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* Fix docstring in pure str (properly typed...).
* Add support of docstring using python literals.

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* Remove backslash in f-string for python 3.10 an 3.11 support.

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* Implement type model for Gherkin json docstring.
* Fix bug of error reported when a step is not registered.
* Improve hint whe a step definition has not been found.
* More documentation.

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* Breaking changes: the tursu_collect_file has moved, so the conftest.py
must updated to:
python
from tursu import tursu_collect_file

tursu_collect_file()

* Implement revered data table ( Column Based ).
* Documentation improved.
* Fix usage of request, capsys or even tursu from step definition functions.
* Refactor and cleanup code

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* Internal refactor without new feature.
* Update the documentation.
* Update gherkin step to follow some good gherkin rules.

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* Write the test module on disk only if --trace or -vvv is used.
This allows to have the full traceback when a test failed with the AST generated code
displayed.