SIENTIAPDE-1248: Integrate MinIO for object storage and add related configurations

This commit introduces MinIO integration for object storage within the Model Manager system. It includes:

- Added MinIO activity class for file operations (fetch, delete).
- Updated Activities orchestrator to include MinIO activities.
- Added MinIO configuration builder to utils/connectors_config.py.
- Added environment variables for MinIO configuration in .env.example.
- Added boto3 and botocore dependencies to requirements.txt.
- Added unit tests for MinIO activities.

requirements.txt

@@ -1,6 +1,8 @@
 temporalio
 psycopg2-binary
 sqlalchemy
+boto3
+botocore
 git+ssh://git@github.com/Aignosi/sientia-dataops-library.git@1.4.6
 git+ssh://git@github.com/Aignosi/sientia-mlops-library.git@0.39.0
 prometheus-client