Implement the initial version of the source generator.

This currently doesn't modify the nodes themselves to add the Accept method nor does it implement the walker yet.

Tsu.TreeSourceGen/src/AnalyzerReleases.Shipped.md

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+; Shipped analyzer releases
+; https://github.com/dotnet/roslyn-analyzers/blob/main/src/Microsoft.CodeAnalysis.Analyzers/ReleaseTrackingAnalyzers.Help.md
+

Tsu.TreeSourceGen/src/AnalyzerReleases.Unshipped.md

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+; Unshipped analyzer release
+; https://github.com/dotnet/roslyn-analyzers/blob/main/src/Microsoft.CodeAnalysis.Analyzers/ReleaseTrackingAnalyzers.Help.md
+
+### New Rules
+
+Rule ID | Category | Severity | Notes
+--------|----------|----------|-------
+TSG0001 | Tsu.TreeSourceGen | Error | TsgDiagnostics
+TSG0002 | Tsu.TreeSourceGen | Error | TsgDiagnostics

Tsu.TreeSourceGen/src/CodeConstants.cs

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+// Copyright © 2024 GGG KILLER <[email protected]>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+// and associated documentation files (the “Software”), to deal in the Software without
+// restriction, including without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom
+// the Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+// BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+namespace Tsu.TreeSourceGen;
+
+internal static class CodeConstants
+{
+    public const string Namespace = "Tsu.TreeSourceGen";
+
+    internal static class TreeNodeAttribute
+    {
+        public const string FullName = "TreeNodeAttribute";
+
+        public const string SourceCode = $$"""
+        using System;
+
+        namespace {{Namespace}};
+
+        [AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = false)]
+        public sealed class {{FullName}}(Type treeRoot) : Attribute
+        {
+            public Type TreeRoot { get; } = treeRoot;
+
+            public string? Name { get; set; }
+        }
+        """;
+    }
+
+    internal static class TreeVisitorAttribute
+    {
+        public const string FullName = "TreeVisitorAttribute";
+
+        public const string SourceCode = $$"""
+        using System;
+
+        namespace {{Namespace}};
+
+        [AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = false)]
+        public sealed class {{FullName}}(Type treeRoot) : Attribute
+        {
+            public Type TreeRoot { get; } = treeRoot;
+        }
+        """;
+    }
+
+    internal static class TreeWalkerAttribute
+    {
+        public const string FullName = "TreeWalkerAttribute";
+
+        public const string SourceCode = $$"""
+        using System;
+
+        namespace {{Namespace}};
+
+        [AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = false)]
+        public sealed class {{FullName}}(Type treeRoot) : Attribute
+        {
+            public Type TreeRoot { get; } = treeRoot;
+        }
+        """;
+    }
+}