SIENTIAPDE-1174

feat: update dependencies and enhance metrics integration

- Updated sientia-dataops-library dependency version from 1.3.5 to 1.3.7 in requirements.txt.
- Incremented image tag in values.yaml from 0.2.7 to 0.3.1.
- Added Prometheus metrics service configuration in values.yaml, enabling metrics collection.
- Implemented Prometheus client in worker.py to start a metrics server and track application health.

orchestrator/metrics.py

@@ -0,0 +1,16 @@
+from prometheus_client import Gauge, Counter
+
+APP_UP = Gauge(
+    "app_up",
+    "Indicates if the application is running (1) or shutting down (0)",
+    ["pod_id"],
+)
+
+CORE_LABELS = ["pod_id", "model_name", "pipeline_name"]
+
+
+EMAIL_SENT_COUNT = Counter(
+    "email_sent_count",
+    "Number of emails sent",
+    [*CORE_LABELS, "email_group"],
+)