Adding creation of data into data handler, marking the way for szdb handling

SzCore/Defaults/DefaultDatabaseHandler.cs

@@ -0,0 +1,33 @@
+using SzCore.DataObjects;
+
+namespace SzCore.Defaults;
+
+public class DefaultDatabaseHandler : ISzDatabaseHandler
+{
+    public bool InternetAllowed { get; set; } = true;
+    public Dictionary<string, string> SzDbUrls { get; set; } = [];
+
+    public SzDataset? TryRetrieveDataset(Guid uuid)
+    {
+        SZ.Logger.LogWarning("The default database helper is not implemented yet");
+        return null;
+    }
+
+    public Task<SzDataset?> TryRetrieveDatasetAsync(Guid uuid)
+    {
+        SZ.Logger.LogWarning("The default database helper is not implemented yet");
+        return null;
+    }
+
+    public ISzTemplate? TryRetrieveTemplate(Guid uuid)
+    {
+        SZ.Logger.LogWarning("The default database helper is not implemented yet");
+        return null;
+    }
+
+    public Task<ISzTemplate?> TryRetrieveTemplateAsync(Guid uuid)
+    {
+        SZ.Logger.LogWarning("The default database helper is not implemented yet");
+        return null;
+    }
+}