Refactor/update api access

[devspexx]

This PR introduces a major internal refactor focused on improving API clarity, structure, and reliability.

API Restructure

• Reorganized package structure for better separation between plugin internals and public API
• Improved overall readability and maintainability

New API Access Pattern

• Introduced ConfigurationProvider as the main entry point
• Simplifies usage and removes direct dependency on internal classes

Naming & Consistency

• Fixed naming inconsistencies across API and internal classes
• Clarified distinction between plugin entry and API layer

Watcher Improvements

• Fixed file deletion handling
• Prevented checksum errors when files are removed
• Improved stability of file watching system

Documentation

• Updated Javadocs across the API
• Improved clarity for developers integrating the API

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This refactor does not introduce breaking behavior, but changes how the API is accessed (via ConfigurationProvider)
Existing integrations may require minor adjustments.