Add more queries

[mpkorstanje]

🤔 What's changed?

Adds several new methods to find all instances of a message:

• findAllTestCaseFinished()
• findAllTestCases()
• findAllTestStepsStarted()
• findAllTestStepsFinished()

Adds several new methods to find messages by TestCaseFinished:

• findMostSevereTestStepResultBy(TestCaseFinished)
• findPickleBy(TestCaseFinished)
• findPickleBy(TestCaseFinished)
• findTestCaseStartedBy(TestCaseFinished)
• findTestStepsFinishedBy(TestCaseFinished)

Adds several new methods to find messages by TestStepFinished:

• findTestCaseBy(TestStepFinished)
• findTestCaseDurationBy(TestStepFinished)
• findTestCaseStartedBy(TestStepFinished)

⚡️ What's your motivation?

The Query object makes it possible to walk the relationships in the Cucumber messages. Adding these methods implements a more complete set of possible operations.

Most of these messages already had a {TestCase, TestStep}Started equivalent. The Finished variation is useful when trying to find (for example) Pickles in response to a {TestCase, TestStep}Finished message.

🏷️ What kind of change is this?

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

📋 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.