[Core] Delegate encoding and BOM handling to gherkin

[mpkorstanje]

🤔 What's changed?

Previously before handing over a feature file to the Gherkin parser, Cucumber would remove any Byte Order Markers (BOM) and determine the encoding of the feature file based on the #encoding: <encoding> comment.

With cucumber/common#2018 this can now be handled by Gherkin. Removing it simplifies Cucumber a little. Unfortunately the FeatureParser doesn't take a InputStream as an argument. So we need to add a default interface to avoid breaking semver.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing 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.

[codecov]

Codecov Report

Merging #2624 (c71b10d) into main (43dec6e) will decrease coverage by 0.07%.
The diff coverage is 81.81%.

❗ Current head c71b10d differs from pull request most recent head e9cd3fa. Consider uploading reports for the commit e9cd3fa to get more accurate results

@@             Coverage Diff              @@
##               main    #2624      +/-   ##
============================================
- Coverage     84.87%   84.79%   -0.08%     
+ Complexity     2699     2693       -6     
============================================
  Files           320      322       +2     
  Lines          9547     9544       -3     
  Branches        913      908       -5     
============================================
- Hits           8103     8093      -10     
- Misses         1111     1120       +9     
+ Partials        333      331       -2     

Impacted Files	Coverage Δ
...n/java/io/cucumber/core/feature/FeatureParser.java	87.50% <50.00%> (-12.50%)	⬇️
...gherkin/messages/GherkinMessagesFeatureParser.java	94.11% <83.33%> (-3.39%)	⬇️
...n/java/io/cucumber/core/gherkin/FeatureParser.java	100.00% <100.00%> (ø)
...c/main/java/io/cucumber/core/gherkin/StepType.java	0.00% <0.00%> (ø)
.../cucumber/core/gherkin/FeatureParserException.java	0.00% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.