feat(validation): complete validation editor and master data modules

validation-suite/backend/mercury/app/modules/helios/service.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+import csv
+from dataclasses import dataclass
+from pathlib import Path
+
+
+@dataclass(frozen=True)
+class MeasurementSeries:
+    headers: list[str]
+    rows: list[dict[str, str]]
+
+
+class HeliosImportService:
+    def import_csv(self, path: Path) -> MeasurementSeries:
+        with path.open(newline="", encoding="utf-8-sig") as handle:
+            reader = csv.DictReader(handle)
+            return MeasurementSeries(headers=reader.fieldnames or [], rows=list(reader))
+