This PR introduces four new methods to the Eloquent Builder:

• whereRelationAny
• orWhereRelationAny
• whereRelationAll
• orWhereRelationAll

These methods are the equivalents of the existing whereAny and whereAll methods available on the base Query Builder.

They allow for more expressive and cleaner filtering when querying related models with multiple conditions, especially when using nested or grouped clauses on relationships.

Before:

Post::query()
  ->whereHas('user', fn($query) => 
    $query->whereAny(['first_name', 'last_name', 'username'], $search)
  );
  
// or
 
Post::query()
  ->whereRelation('user', 'first_name', $search)
  ->orWhereRelation('user', 'last_name', $search)
  ->orWhereRelation('user', 'username', $search);

After:

Post::query()
  ->whereRelationAny('user', ['first_name', 'last_name', 'username'], $search);

These methods significantly improve readability and developer productivity by avoiding complex closures when applying multiple relationship filters.

Key Benefits:

1. Simplifies Relationship Queries: Reduces nested closures and repetitive whereHas/orWhereHas calls.
2. Consistent Syntax: Matches the existing whereAny/whereAll conventions in the Query Builder.
3. Improved Readability: Clear intent when querying relationships with ANY/ALL logic.

These methods maintain backward compatibility and follow Laravel’s coding standards.