Add macro metadata dart_model types and converter.

pkgs/_analyzer_cfe_macros/analysis_options.yaml

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+include: package:dart_flutter_team_lints/analysis_options.yaml

pkgs/_analyzer_cfe_macros/mono_pkg.yaml

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+sdk:
+# Only "pubspec" for when using SDK via a hash reference for latest
+# `_fe_analyzer_shared`.
+- pubspec
+
+stages:
+- analyze_and_format:
+  - analyze: --fatal-infos .
+  - format:
+    sdk:
+    - dev
+- unit_test:
+  - test: --test-randomize-ordering-seed=random
+    os:
+    - linux
+    - windows

pkgs/_analyzer_cfe_macros/pubspec.yaml

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+name: _analyzer_cfe_macros
+publish-to: none
+description: Macro support for the analyzer and CFE.
+resolution: workspace
+
+environment:
+  sdk: ^3.7.0-39.0.dev
+
+dependencies:
+  _fe_analyzer_shared: any
+  dart_model: any
+
+dev_dependencies:
+  dart_flutter_team_lints: ^3.0.0
+  test: ^1.25.0

pkgs/_analyzer_cfe_macros/test/metadata_converter_test.dart

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+// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:_analyzer_cfe_macros/metadata_converter.dart';
+import 'package:_fe_analyzer_shared/src/metadata/ast.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('converts with unions', () {
+    final invocation = MethodInvocation(DoubleLiteral('1.23'), 'round', [], []);
+
+    expect(convert<Object>(invocation), <String, Object?>{
+      'receiver': {
+        'type': 'DoubleLiteral',
+        'value': {'text': '1.23'}
+      },
+      'name': 'round',
+      'typeArguments': [],
+      'arguments': [],
+    });
+  });
+
+  test('converts with enums', () {
+    final expression = BinaryExpression(
+        DoubleLiteral('1.23'), BinaryOperator.minus, DoubleLiteral('1.24'));
+
+    expect(convert<Object>(expression), <String, Object?>{
+      'left': {
+        'type': 'DoubleLiteral',
+        'value': {'text': '1.23'}
+      },
+      'operator': 'minus',
+      'right': {
+        'type': 'DoubleLiteral',
+        'value': {'text': '1.24'}
+      }
+    });
+  });
+
+  test('converts with lists', () {
+    final invocation = MethodInvocation(DoubleLiteral('1.23'), 'round', [],
+        [PositionalArgument(IntegerLiteral('4'))]);
+
+    expect(convert<Object>(invocation), <String, Object?>{
+      'receiver': {
+        'type': 'DoubleLiteral',
+        'value': {'text': '1.23'}
+      },
+      'name': 'round',
+      'typeArguments': [],
+      'arguments': [
+        {
+          'expression': {
+            'type': 'IntegerLiteral',
+            'value': {'text': '4'}
+          }
+        }
+      ]
+    });
+  });
+}