Merging WCR /WinAI API sample from feature branch to main branch (#467)

This change brings stable version of WCR sample from feature branch to main branch.
Given Language Model related changes didn't make into stable, and are experimental, they are removed.
Image object remover is also removed because it was experimental.

WindowsCopilotRuntime renamed to WindowsAIFoundry
and WindowsCopilotRuntimeSample renamed to WindowsAISample for all namespaces.
README and contributing doc moved inside cs-winui because other samples will also exist within this folder.

Author: pratikone

README.md

@@ -2,11 +2,11 @@
  Licensed under the MIT License. -->
 
 <Application
-    x:Class="WindowsCopilotRuntimeSample.App"
+    x:Class="WindowsAISample.App"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:local="using:WindowsCopilotRuntimeSample"
-    xmlns:local_converters="using:WindowsCopilotRuntimeSample.Converters">
+    xmlns:local="using:WindowsAISample"
+    xmlns:local_converters="using:WindowsAISample.Converters">
     <Application.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
@@ -16,7 +16,6 @@
             <!-- Other app resources here -->
             <local_converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter"/>
             <local_converters:NullToVisibilityConverter x:Key="NullToVisibilityConverter"/>
-            <local_converters:EmbeddingVectorConverter x:Key="EmbeddingVectorConverter"/>
             <local_converters:ContentFilterOptionsSeverityLevelConverter x:Key="ContentFilterOptionsSeverityLevelConverter"/>
 
             <!--  Window width adaptive breakpoints.  -->

…/WindowsCopilotRuntime/cs-winui/App.xaml …mples/WindowsAIFoundry/cs-winui/App.xamlSamples/WindowsCopilotRuntime/cs-winui/App.xaml renamed to Samples/WindowsAIFoundry/cs-winui/App.xaml Samples/WindowsCopilotRuntime/cs-winui/App.xaml renamed to Samples/WindowsAIFoundry/cs-winui/App.xaml

@@ -7,7 +7,7 @@
 // To learn more about WinUI, the WinUI project structure,
 // and more about our project templates, see: http://aka.ms/winui-project-info.
 
-namespace WindowsCopilotRuntimeSample
+namespace WindowsAISample
 {
     public partial class App : Application
     {