Add TickMethodFunction and SymbolFunction (#176)

Co-authored-by: James Yeung <shunjiey@hotmail.com>

Author: HuaFangYun

src/AntDesign.Charts.Docs/Demos/Pie/Pie_Chart.razor

@@ -57,6 +57,7 @@
         {
             Visible = true,
             Type = "inner",
+            Formatter = " (datum) => { return datum.value+'%'; }",
         },
     };