feat StayExport - Initial Implementation

- Created models for DB and DTOs: StayExportFile
- Added required db migrations.
- Added StayExportService and StayExportServiceFactory for stay exporting services.
- Added configuration options required for StayExport.

src/Somnia.GuestLog/Models/EntityMapping.cs

@@ -51,4 +51,24 @@ internal static class EntityMapping
         };
     }
 
+    public static StayExportFileDTO MapStayExportFileEntityToDTO(StayExportFile entity)
+    {
+        StayExportParamsDTO exportParamsDto = new()
+        {
+            ExportType = entity.ExportParams.ExportType,
+            ExportPeriodStart = entity.ExportParams.ExportPeriodStart,
+            ExportPeriodEnd = entity.ExportParams.ExportPeriodEnd,
+        };
+
+        return new()
+        {
+            Id = entity.Id,
+            ExportFormat = entity.ExportFormat,
+            ExportParams = exportParamsDto,
+            ExportResult = entity.ExportResult,
+            ExportedPath = entity.ExportedPath,
+            ExportTime = entity.ExportTime,
+        };
+    }
+
 }