Add support to prefixed containers

[estevao90]

Summary

This pull request adds support for namespace-prefixed (e.g., Strauss/Mozart) container interfaces in PHPStan by introducing a configurable extension. This allows dynamic return type resolution for containers whose interfaces have been rewritten and no longer share ancestry with the bundled StellarWP or PSR interfaces.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• ⚡ Performance improvement
• ♻️ Code refactoring
• 🧪 Test improvements
• 🔧 Chore (build process, dependencies, etc.)

Related Issues

Closes #

Pre-Submission Checklist

Code Quality

• PHPStan analysis passes
• Coding standards pass
• All tests pass
• No debug code (var_dump, error_log, etc.) left in production code
• No commented-out code unless specifically needed for reference
• Documentation updated for any new features or changed behavior
• New tests have been added for new functionality
• All existing tests continue to pass

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