Fix modifier of the generated options builder object.

Author: walterlv

src/DotNetCampus.CommandLine.Analyzer/Generators/BuilderGenerator.cs

@@ -75,7 +75,7 @@ namespace {{model.Namespace}};
 /// <summary>
 /// 辅助 <see cref="{{model.CommandObjectType.ToGlobalDisplayString()}}"/> 生成命令行选项、谓词或处理函数的创建。
 /// </summary>
-internal sealed class {{model.GetBuilderTypeName()}}
+{{(model.IsPublic ? "public" : "internal")}} sealed class {{model.GetBuilderTypeName()}}
 {
     public static object CreateInstance(global::DotNetCampus.Cli.CommandLine commandLine)
     {

src/DotNetCampus.CommandLine.Analyzer/Generators/ModelProviding/CommandModelProvider.cs

@@ -81,11 +81,13 @@ public static IncrementalValuesProvider<CommandObjectGeneratingModel> SelectComm
 
                 var @namespace = typeSymbol.ContainingNamespace.ToDisplayString();
                 var verbName = attribute?.ConstructorArguments[0].Value?.ToString();
+                var isPublic = typeSymbol.DeclaredAccessibility == Accessibility.Public;
 
                 return new CommandObjectGeneratingModel
                 {
                     Namespace = @namespace,
                     CommandObjectType = typeSymbol,
+                    IsPublic = isPublic,
                     VerbName = verbName,
                     IsHandler = isHandler,
                     OptionProperties = optionProperties,
@@ -132,6 +134,8 @@ internal record CommandObjectGeneratingModel
 
     public required INamedTypeSymbol CommandObjectType { get; init; }
 
+    public required bool IsPublic { get; init; }
+
     public required string? VerbName { get; init; }
 
     public required bool IsHandler { get; init; }