Refactor Namespace and Seald Classes in Microsoft.ML.AutoML.SourceGenerator Project (#7223)

* Make all classes in Microsoft.ML.AutoML.SourceGenerator project `sealed`

* Refactor namespace from Microsoft.ML.ModelBuilder.SweepableEstimator.CodeGenerator to Microsoft.ML.AutoML.SourceGenerator

tools-local/Microsoft.ML.AutoML.SourceGenerator/Constant.cs

@@ -4,7 +4,7 @@
 
 namespace Microsoft.ML.AutoML.SourceGenerator
 {
-    internal class Constant
+    internal sealed class Constant
     {
         public const string CodeGeneratorNameSpace = "Microsoft.ML.AutoML.CodeGen";
     }

tools-local/Microsoft.ML.AutoML.SourceGenerator/EstimatorContract.cs

@@ -9,7 +9,7 @@ using System.Text.Json.Serialization;
 
 namespace Microsoft.ML.AutoML.SourceGenerator
 {
-    internal class EstimatorContract
+    internal sealed class EstimatorContract
     {
         [JsonPropertyName("functionName")]
         public string FunctionName { get; set; }

tools-local/Microsoft.ML.AutoML.SourceGenerator/EstimatorTypeGenerator.cs

@@ -15,7 +15,7 @@ using Microsoft.ML.AutoML.SourceGenerator.Template;
 namespace Microsoft.ML.AutoML.SourceGenerator
 {
     [Generator]
-    public class EstimatorTypeGenerator : ISourceGenerator
+    public sealed class EstimatorTypeGenerator : ISourceGenerator
     {
         private const string className = "EstimatorType";
         private const string fullName = Constant.CodeGeneratorNameSpace + "." + className;

tools-local/Microsoft.ML.AutoML.SourceGenerator/SearchSpaceGenerator.cs

@@ -15,7 +15,7 @@ using Microsoft.ML.AutoML.SourceGenerator.Template;
 namespace Microsoft.ML.AutoML.SourceGenerator
 {
     [Generator]
-    public class SearchSpaceGenerator : ISourceGenerator
+    public sealed class SearchSpaceGenerator : ISourceGenerator
     {
         public void Execute(GeneratorExecutionContext context)
         {

tools-local/Microsoft.ML.AutoML.SourceGenerator/SweepableEstimatorFactoryGenerator.cs

@@ -13,7 +13,7 @@ using Microsoft.ML.AutoML.SourceGenerator.Template;
 namespace Microsoft.ML.AutoML.SourceGenerator
 {
     [Generator]
-    public class SweepableEstimatorFactoryGenerator : ISourceGenerator
+    public sealed class SweepableEstimatorFactoryGenerator : ISourceGenerator
     {
         private const string className = "SweepableEstimatorFactory";
 

tools-local/Microsoft.ML.AutoML.SourceGenerator/SweepableEstimatorGenerator.cs

@@ -2,22 +2,17 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Text.Json;
 using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Text;
-using Microsoft.ML.AutoML.SourceGenerator;
-using SweepableEstimator = Microsoft.ML.AutoML.SourceGenerator.Template.SweepableEstimator;
 using SweepableEstimatorT = Microsoft.ML.AutoML.SourceGenerator.Template.SweepableEstimator_T_;
-namespace Microsoft.ML.ModelBuilder.SweepableEstimator.CodeGenerator
+namespace Microsoft.ML.AutoML.SourceGenerator
 {
     [Generator]
-    public class SweepableEstimatorGenerator : ISourceGenerator
+    public sealed class SweepableEstimatorGenerator : ISourceGenerator
     {
         private const string SweepableEstimatorAttributeDisplayName = Constant.CodeGeneratorNameSpace + "." + "SweepableEstimatorAttribute";
 

tools-local/Microsoft.ML.AutoML.SourceGenerator/Utils.cs

@@ -10,7 +10,7 @@ using System.Text.Json;
 
 namespace Microsoft.ML.AutoML.SourceGenerator
 {
-    internal class Utils
+    internal sealed class Utils
     {
         public static EstimatorsContract GetEstimatorsFromJson(string json)
         {