feat: Add ExtendedObservableCollection and update MyNet.Utilities

Updated MyNet.Utilities package to version 5.2.1-pre.6

Added a new class ExtendedObservableCollection<T> in
ExtendedObservableCollection.cs, inheriting from
OptimizedObservableCollection<T> and implementing
IObservableCollection<T> and IExtendedList<T> interfaces.

src/MyNet.DynamicData.Extensions/ExtendedObservableCollection.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Stéphane ANDRE. All Right Reserved.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Generic;
+using DynamicData;
+using DynamicData.Binding;
+using MyNet.Utilities.Collections;
+
+namespace MyNet.DynamicData.Extensions
+{
+    public class ExtendedObservableCollection<T> : OptimizedObservableCollection<T>, IObservableCollection<T>, IExtendedList<T>
+    {
+        public ExtendedObservableCollection() : base() { }
+
+        public ExtendedObservableCollection(List<T> list) : base(list) { }
+
+        public ExtendedObservableCollection(IEnumerable<T> collection) : base(collection) { }
+    }
+}

src/MyNet.DynamicData.Extensions/MyNet.DynamicData.Extensions.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="DynamicData" Version="9.0.4" />
-    <PackageReference Include="MyNet.Utilities" Version="5.0.0" />
+    <PackageReference Include="MyNet.Utilities" Version="5.2.1-pre.6" />
   </ItemGroup>
 
 </Project>