refactor(visual_suggestion): delegate visualization recommendation logic to dedicated recommender module

- Removed the inlined `VisualizationRecommender` class from `suggestions.py` and imported it from `visual_suggestion.recommender`
- Simplified `suggestions.py` to serve as a lightweight interface for visualization recommendation
- Updated `__init__.py` imports to correctly expose `VisualizationRecommender` from its new package
- Enhanced `recommender()` function to support:
  - `StrategyName` parameter for configurable model selection strategy
  - `selected_models`, `interactive`, and `timeout` arguments for flexible runtime behavior
- Improved module clarity and reduced redundancy by centralizing model, API, and ensemble logic under the recommender system

Author: DYung26

plotsense/visual_suggestion/__init__.py

@@ -1 +1,2 @@
-from plotsense.visual_suggestion.suggestions import recommender, VisualizationRecommender
+from plotsense.visual_suggestion.suggestions import recommender
+from plotsense.visual_suggestion.recommender import VisualizationRecommender