chore(EditorConfig): add namespace rules (#7136)

* chore: 增加命名空间提示信息配置

* chore: 增加命名空间格式配置

Author: ArgoZhang

.editorconfig

@@ -19,5 +19,8 @@ indent_size = 2
 end_of_line = lf
 
 [*.cs]
+dotnet_analyzer_diagnostic.category-Style.severity = none
+csharp_style_namespace_declarations = file_scoped:silent
+
 # Add file header
 file_header_template = Licensed to the .NET Foundation under one or more agreements.\nThe .NET Foundation licenses this file to you under the Apache 2.0 License\nSee the LICENSE file in the project root for more information.\nMaintainer: Argo Zhang([email protected]) Website: https://www.blazor.zone