refactor(DockView): support multiple custom class (#3866)

* fix: 修复报告页面不显示

* chore: bump version 8.0.5

* fix:  修复点击收起列表里的tab时index不同步的问题

* chore: bump version 8.0.6

---------

Co-authored-by: zhaijunlei <276318515@qq.com>

src/Extensions/Components/BootstrapBlazor.DockView/BootstrapBlazor.DockView.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <PropertyGroup>
-    <Version>8.0.4</Version>
+    <Version>8.0.6</Version>
   </PropertyGroup>
 
   <PropertyGroup>

src/Extensions/Components/BootstrapBlazor.DockView/wwwroot/js/dockview-content.js

@@ -21,7 +21,9 @@
             tab._content.style.width = `${titleWidth}px`;
         }
         if (panelClass) {
-            content.element.classList.add(panelClass);
+            panelClass.split(' ').forEach(className => {
+                content.element.classList.add(className);
+            });
         }
     }