SIENTIAPDE-1712

Enhance README and Implement Drift Detection and Metrics Workflows

- Added new sections in README for Drift Workflow and Simple Metrics Workflow, detailing their execution flows and functionalities.
- Introduced `drift.py` for data drift detection, comparing current data against reference datasets.
- Added `simple_metrics.py` for calculating regression metrics (RMSE, MSE, MAE, R²).
- Updated `values.yaml` to include configuration for MinIO retention hours and offload threshold.
- Refactored `minio_dataframe_payload.py` to use the new offload threshold environment variable.
- Adjusted tests to reflect changes in environment variable handling for MinIO offload threshold.

values.yaml

@@ -231,6 +231,10 @@ env:
     value: "sa-east-1"
   - name: MINIO_DEFAULT_BUCKET
     value: "sientia"
+  - name: MINIO_RETENTION_HOURS
+    value: "24"
+  - name: SIENTIA_MINIO_OFFLOAD_THRESHOLD_MEGABYTES
+    value: "1.5"
 
   - name: PI_WEB_API_BASE_URL
     value: "https://pivision.votorantimcimentos.com/piwebapi"