feat: add DailyStatusRepository for managing and persisting state

- Also add model for DailyStatus

lib/data_storage/models/daily_entry_model.dart

@@ -0,0 +1,15 @@
+
+class DailyEntry {
+  final DateTime date;
+  final bool feelingMigrainy;
+  final bool tookZomig;
+  final bool hadMigraine;
+  final bool tookPainMeds;
+
+  const DailyEntry({
+    required this.date,
+    required this.feelingMigrainy,
+    required this.tookZomig,
+    required this.hadMigraine,
+    required this.tookPainMeds});
+}