Added detailed plugin information to the plugins page (#1013)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/PluginSystem/IPluginMetadata.cs

@@ -37,6 +37,11 @@ public interface IPluginMetadata
     /// </summary>
     public PluginVersion Version { get; }
 
+    /// <summary>
+    /// When this plugin was last changed, in UTC, when the plugin states it.
+    /// </summary>
+    public DateTimeOffset? LastChanged { get; }
+
     /// <summary>
     /// The authors of this plugin.
     /// </summary>