Add rule logic

[jsa34]

Make keywords for gherkin not hardcoded Add logic for handling rules Permeate keywords and synonyms that rule-based format tends to use to outputs used in Pytest-BDD

[youtux]

Hey would you mind splitting this into multiple PRs? It would make it easier to review. They can be sta led on top of each other

[jsa34]

Okie dokie :)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.98361% with 11 lines in your changes missing coverage. Please review.

Project coverage is 95.56%. Comparing base (00916ff) to head (071bb12). Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/pytest_bdd/gherkin_terminal_reporter.py	87.23%	4 Missing and 2 partials :warning:
src/pytest_bdd/generation.py	42.85%	3 Missing and 1 partial :warning:
src/pytest_bdd/parser.py	97.56%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #726 +/- ## ========================================== - Coverage 95.60% 95.56% -0.04% ========================================== Files 54 55 +1 Lines 2071 2143 +72 Branches 231 249 +18 ========================================== + Hits 1980 2048 +68 - Misses 55 58 +3 - Partials 36 37 +1 ```

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[jsa34]

I'll do one at a time - just raised #727

[youtux]

Can you rebase your changes on the master branch?

[jsa34]

Ugh - it's got messy... I'll open a new PR