Add DbModelConfigurationException class to exceptions

Introduced DbModelConfigurationException in the ReC.Infrastructure.Exceptions namespace. This custom exception inherits from Exception and includes both a message constructor and a parameterless constructor for flexible error handling related to DB model configuration issues.

src/ReC.Infrastructure/Exceptions/DbModelConfigurationException.cs

@@ -0,0 +1,12 @@
+namespace ReC.Infrastructure.Exceptions;
+
+public class DbModelConfigurationException : Exception
+{
+    public DbModelConfigurationException(string message) : base(message)
+    {
+    }
+
+    public DbModelConfigurationException()
+    {
+    }
+}