SIENTIAPDE-1251: Implement ML model training activity and repository

This commit introduces the 'Training' activity and 'TrainingRepository' for handling ML model training operations within the Model Manager system.

- Added model_manager/activities/training.py for the Training activity, which extends BaseActivity and integrates with Temporal workflows.
- Added model_manager/utils/repository/training_repository.py for the TrainingRepository, which encapsulates the core training logic.
- Updated model_manager/activities/activities.py to include the Training activity in the main activities orchestrator.
- Updated README.md to document the new 'Training' component.
- Added unit tests for the new activity and repository.

model_manager/activities/activities.py

@@ -10,9 +10,10 @@ with workflow.unsafe.imports_passed_through():
     from model_manager.activities.gates import Gates
     from model_manager.activities.minio import MinIO
     from model_manager.activities.mlflow import MLFlow
+    from model_manager.activities.training import Training
 
 
-class Activities(ExperimentTracking, MLFlow, MinIO, Gates):
+class Activities(ExperimentTracking, MLFlow, MinIO, Gates, Training):
     """
     Main activities orchestrator for the Model Manager system.
 
@@ -25,6 +26,7 @@ class Activities(ExperimentTracking, MLFlow, MinIO, Gates):
     - MLFlow: Model inference and transformation operations
     - MinIO: Object storage operations (file upload/download/delete)
     - Gates: Data quality validation and filtering mechanisms
+    - Training: ML model training operations (extends BaseActivity)
 
     Attributes:
         postgres_config (dict): PostgreSQL connection configuration
@@ -102,6 +104,8 @@ class Activities(ExperimentTracking, MLFlow, MinIO, Gates):
 
         Gates.__init__(self, logger=logger, notification_handler=notification_handler)
 
+        Training.__init__(self, logger=logger, notification_handler=notification_handler)
+
     async def shutdown(self):
         """
         Gracefully shutdown all activities and clean up resources.