Refactor WrapperView to draw drawable features (dotnet#186)

* Refactor WrapperView to draw drawable features

* Update class names and devide files

* Override NeesContainer to remove duplicated code

* Update class names

Author: JoonghyunCho

src/Core/src/Platform/Tizen/IWrapperViewCanvas.cs

@@ -0,0 +1,8 @@
+
+namespace Microsoft.Maui
+{
+	public interface IWrapperViewCanvas
+	{
+		public IWrapperViewDrawables Drawables { get; }
+	}
+}

src/Core/src/Platform/Tizen/WrapperView.cs

@@ -11,7 +11,7 @@
 
 namespace Microsoft.Maui.Platform
 {
-	public interface IBackgroundCanvas
+	public partial class WrapperView : Canvas, IWrapperViewCanvas
 	{
 		public SkiaGraphicsView BackgroundCanvas { get; }
 	}