Add foundation

Toolkit.Foundation/ConfigurationValue.cs

@@ -0,0 +1,25 @@
+namespace Toolkit.Foundation;
+
+public class ConfigurationValue<TConfiguration, TValue>(Func<TConfiguration, Action<TValue>> changed)
+    where TValue : 
+    class, new()
+{
+    private TValue? currentValue;
+
+    public bool TryUpdate(TConfiguration configuration, 
+        out TValue value)
+    {
+        TValue newValue = new();
+        changed(configuration).Invoke(newValue);
+
+        if (!EqualityComparer<TValue>.Default.Equals(currentValue, newValue))
+        {
+            value = newValue;
+            currentValue = newValue;
+            return true;
+        }
+
+        value = currentValue!;
+        return false;
+    }
+}