Added behat arg detection, added related test

[MolbioUnige]

The test file contains valid Behat inputs.
Detected arguments are turned into regex.

🤔 What's changed?

I have changed how phpLanguage parses step definition in context files. Behat allows to define arguments in the definition that will be passed as function parameters, see Behat doc.

I have added a test file with various valid Behat definitions and there corresponding output after parsing.

I've tested my changes in vim. I can see that the lsp detects step definitions that contains argument, which it didn't before, see corresponding screenshots in annexes . The step suggestions are also working better but not perfectly, see corresponding screenshots in annexes

⚡️ What's your motivation?

The current implementation only detects corresponding strings, that is, arguments (:arg) are not considered as variable but treated literally. That is, in my opinion, useless. Same goes for step suggestions.

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)

♻️ Anything particular you want feedback on?

LSP suggestions only detects step definitions on the first typed character. Adding a second one, the suggestions are gone, see corresponding screenshots.

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

Annexes

Diagnostics

Done with the same files

Before

After

Suggestions

Before

After

Suggestions fails if more then one character is typed

One character typed

Adding a second one

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