Add support for Laravel scope attributes in joinRelationship callbacks

[luisdalmolin]

Summary

• Add support for Laravel's new #[Scope] attribute syntax in joinRelationship callbacks
• Fix issue where methods with scope attributes were not recognized by PowerJoinClause

Problem

The new Laravel scope attribute (#[\Illuminate\Database\Eloquent\Attributes\Scope]) was not working with PowerJoins when used in joinRelationship callbacks, causing the error: "Method inCountry does not exist in PowerJoinClause class".

Solution

Enhanced PowerJoinClause::__call() method to:

• Check for Laravel scope attributes using reflection after checking traditional scopes
• Use Laravel's callNamedScope() method for proper parameter handling
• Maintain backward compatibility with traditional scopeMethodName syntax

Changes

• src/PowerJoinClause.php: Added hasLaravelScopeAttribute() method and updated __call() to support scope attributes
• tests/LaravelScopeAttributeTest.php: Added comprehensive test case reproducing the issue
• tests/Models/: Added City, Country, CountryEnum models and updated Address model for testing
• tests/database/migrations/: Extended migration to include countries and cities tables

Test plan

• New test passes demonstrating scope attribute functionality
• All existing tests (118) continue to pass - no regressions
• Code follows project style guidelines after linting

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