feat: possibility to get child group using path

[ToMark1881]

Short description 📝

Introduced a utility method to safely retrieve a subgroup from a given PBXGroup by matching its path.

Solution 📦

When working with nested group structures in Xcode projects, it's often necessary to look up a child group by path. This helper method encapsulates that logic in a clean and reusable way.
Alternative solutions could involve manual iteration and casting outside of the group context, but encapsulating it as a method improves readability and encourages reuse.

Implementation 👩‍💻👨‍💻

• Added group(with:) method to locate a PBXGroup by path among the group's children
• Filtered childrenReferences and safely casted matching items to PBXGroup
• Added documentation comment describing the purpose and usage of the method

[fortmarek]

Sorry for the belated review here.

I'm aligned with adding this convenience method, once the CI passes, we can merge this one 🤝

[fortmarek]

Actually ... what do you think about adding some basic unit tests for this new method?

[ToMark1881]

Actually ... what do you think about adding some basic unit tests for this new method?

Done sir!