[Core] Follow symlinks when loading feature files

[fobo66]

Fixes #2042

Describe the solution you have implemented
I've added option for walkFileTree method to follow symlinks and added tests for PathScanner that involve symlinks

Additional context
Add any other context or screenshots about the pull request here.

[coveralls]

Coverage increased (+0.002%) to 86.197% when pulling 69671db on fobo66:follow-symlinks into b57b924 on cucumber:main.

[aslakhellesoy]

Hi @fobo66,

Thanks for your making your first contribution to Cucumber, and welcome to the Cucumber committers team! You can now push directly to this repo and all other repos under the cucumber organization! 🍾

In return for this generous offer we hope you will:

• ✅ Continue to use branches and pull requests. When someone on the core team approves a pull request (yours or someone else's), you're welcome to merge it yourself.
• 💚 Commit to setting a good example by following and upholding our code of conduct in your interactions with other collaborators and users.
• 💬 Join the community Slack channel to meet the rest of the team and make yourself at home.
• ℹ️ Don't feel obliged to help, just do what you can if you have the time and the energy.
• 🙋 Ask if you need anything. We're looking for feedback about how to make the project more welcoming, so please tell us!

On behalf of the Cucumber core team,
Aslak Hellesøy
Creator of Cucumber

[mpkorstanje]

Cheers. This looks al right!

[fobo66]

Thanks!