Port "TextSearch.Text" attached property from WPF

[maxkatz6]

Is your feature request related to a problem? Please describe.
Right now ComboBox/ItemsControl search feature uses Content?.ToString() to find items.
To make it flexible we need TextSearch.Text property, like it exists in WPF.

Describe the solution you'd like

<ComboBox IsTextSearchEnabled="True">
  <Image TextSearch.Text="Cat" Source="data\cat.png"/>
  <Image TextSearch.Text="{Binding Name}" Source="data\dog.png"/>
  <Image TextSearch.Text="{CompiledBinding Name}" Source="data\fish.png"/>
</ComboBox>

<ComboBox IsTextSearchEnabled="True" Items="{Binding Items}">
  <ComboBox.ItemTemplate>
     <DataTemplate>
       <Image TextSearch.Text="{Binding Name}" Source="{Binding Source}"/>
     </DataTemplate>
  </ComboBox.ItemTemplate>
</ComboBox>

Describe alternatives you've considered
WPF also has "TextSearch.TextPath" property, but we want to avoid reflection-based features as much as possible, unless it's possible to easily implement it in compile-time way. Also having "TextSearch.Text" more than enough to have text search flexible.

Additional context
https://docs.microsoft.com/en-us/dotnet/api/system.windows.controls.textsearch?view=net-5.0