[fxcop] Settings UI library (part 4) - project/namespace renames (#7403)

* Rename Interface to Interfaces in namespaces

* Rename Lib to Library in namespaces

* Rename project and directory and enable fxcop

* Add CA2213 suppression

* Minor fixes

src/core/Microsoft.PowerToys.Settings.UI.Library/Utilities/IIOProvider.cs

@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.PowerToys.Settings.UI.Library.Utilities
+{
+    public interface IIOProvider
+    {
+        bool FileExists(string path);
+
+        bool DirectoryExists(string path);
+
+        bool CreateDirectory(string path);
+
+        void DeleteDirectory(string path);
+
+        void WriteAllText(string path, string content);
+
+        string ReadAllText(string path);
+    }
+}