feat(IFrame): add attributes support (#6160)

Author: ArgoZhang

src/BootstrapBlazor/Components/IFrame/IFrame.razor

@@ -2,4 +2,4 @@
 @inherits BootstrapModuleComponentBase
 @attribute [BootstrapModuleAutoLoader(JSObjectReference = true)]
 
-<iframe id="@Id" src="@Src" frameborder="0" class="@ClassString"></iframe>
+<iframe @attributes="AdditionalAttributes" id="@Id" src="@Src" class="@ClassString"></iframe>