Refactor Engines to rely on ClauseFactory/Clause

[kettasoft]

Overview

This pull request refactors the Engines to depend more on ClauseFactory and Clause,
resulting in cleaner and more consistent filtering logic across the package.

Changes

• Updated Engines to delegate field/operator resolution to ClauseFactory.
• Improved validation and consistency of clause handling.
• Reduced duplicated logic between different Engines.
  for safer relation path validation.

Benefits

• Centralized clause creation logic.
• Easier to maintain and extend Engines in the future.
• Clearer separation of responsibilities between Engines and ClauseFactory.