v6.0.0

Read Upgrade guide for library breaking changes

Upgrade to Intervention Image v3

• Update links and descriptions to align with Intervention Image 3.x API.
• Replace Image with ImageInterface for compatibility.
• Update processors to use new methods (e.g., scaleDown, coverDown).
• Remove deprecated methods and adapt to the 3.x API.
• Add BackgroundColorProcessor and remove LimitColorsProcessor.
• Support for watermark placement via configuration.
• Update RotateProcessor to allow custom background color for rotation.
• Remove ProgressiveProcessor in favor of event-based handling: ProgressiveSubscriber.
• Add ImageEncoderInterface and update ImageEncoder to implement it.

Add Unit and functional tests

• Add tests for various image transformations
• Validate output using MD5 hash comparison.
• Update GitHub Actions workflow to run unit tests.