Memory optimization: dispose native objects when related to document content injected to the TextBlock element

Source/QuestPDF/Elements/Text/TextBlock.cs

@@ -54,6 +54,10 @@ namespace QuestPDF.Elements.Text
         public void Dispose()
         {
             Paragraph?.Dispose();
+            
+            foreach (var textBlockElement in Items.OfType<TextBlockElement>())
+                textBlockElement.Element.ReleaseDisposableChildren();
+            
             GC.SuppressFinalize(this);
         }