Architecture: Decouple MyrestNormalizer from hardcoded module dependencies

Problem/Motivation

MyrestNormalizer has hardcoded dependencies on myfacet and myrest_metatag. This prevents the module from being used in environments where these modules are not present.

Proposed resolution

• Introduce interfaces for the dependent services.
• Use an event-driven approach (Events or Plugins) to allow other modules to inject data into the normalization process.
• Ensure the normalizer gracefully handles the absence of optional modules.

Remaining tasks

Refactor the normalizer to remove direct class dependencies.

User interface changes

None.

API changes

Introduction of new events or interfaces for normalization extensibility.