Refactor DataLayer: Separate Plugin Logic from Runtime Orchestration

[Mohamedma96]

This issue proposes a clearer separation of responsibilities in the DataLayer architecture.

DataLayer plugins (e.g., sources, extractors) should focus strictly on their business logic.
All validation, lifecycle management, and orchestration should be handled by a runtime layer.

The new runtime will:

• Own all registered sources
• Manage source–extractor mappings
• Handle validation and orchestration logic

This issue serves as the main tracking issue for a series of PRs that will implement the separation between the runtime and plugins.

[Mohamedma96]

/assign