Added exclude API to DotPathQL, improved design with better SoC

[petruki]

This pull request introduces a new property exclusion feature to the DotPathQL library, allowing users to exclude specific properties from object extraction. The changes include updates to the documentation, enhancements to the main DotPathQL class, and the addition of supporting classes for exclusion logic. The overall API is now more flexible, supporting both selective inclusion and exclusion of properties.

New Exclusion Feature and API Enhancements:

• Added support for property exclusion, allowing users to specify fields to omit from extraction using the new exclude method in DotPathQL.

Documentation Updates:

• Updated the README.md to document the new exclusion feature, including usage examples for both filtering and exclusion, and real-world scenarios such as data privacy and API response customization. [1] [2] [3]

Codebase Refactoring and Simplification:

• Refactored DotPathQL to delegate filtering and exclusion logic to dedicated classes (PathFilter and PathExclude), removing complex path expansion and property access code from the main class. [1] [2]
• Simplified imports in DotPathQL.java to only include necessary classes.