Add contentPadding property for RadioListTile (#67438)

Exposes contentPadding property for RadioListTile from its appropriate ListTile.

packages/flutter/lib/src/material/radio_list_tile.dart

@@ -319,6 +319,7 @@ class RadioListTile<T> extends StatelessWidget {
     this.selected = false,
     this.controlAffinity = ListTileControlAffinity.platform,
     this.autofocus = false,
+    this.contentPadding,
 
   }) : assert(toggleable != null),
        assert(isThreeLine != null),
@@ -469,6 +470,14 @@ class RadioListTile<T> extends StatelessWidget {
   /// {@macro flutter.widgets.Focus.autofocus}
   final bool autofocus;
 
+  /// Defines the insets surrounding the contents of the tile.
+  ///
+  /// Insets the [Radio], [title], [subtitle], and [secondary] widgets
+  /// in [RadioListTile].
+  ///
+  /// When null, `EdgeInsets.symmetric(horizontal: 16.0)` is used.
+  final EdgeInsetsGeometry? contentPadding;
+
   /// Whether this radio button is checked.
   ///
   /// To control this value, set [value] and [groupValue] appropriately.
@@ -519,6 +528,7 @@ class RadioListTile<T> extends StatelessWidget {
           } : null,
           selected: selected,
           autofocus: autofocus,
+          contentPadding: contentPadding,
         ),
       ),
     );

packages/flutter/test/material/radio_list_tile_test.dart

@@ -606,4 +606,44 @@ void main() {
     await tester.pump();
     expect(Focus.of(childKey.currentContext!)!.hasPrimaryFocus, isFalse);
   });
+
+  testWidgets('RadioListTile contentPadding test', (WidgetTester tester) async {
+    final Type radioType = const Radio<bool>(
+      groupValue: true,
+      value: true,
+      onChanged: null,
+    ).runtimeType;
+
+    await tester.pumpWidget(
+      wrap(
+        child: Center(
+          child: RadioListTile<bool>(
+            groupValue: true,
+            value: true,
+            title: const Text('Title'),
+            onChanged: (_){},
+            contentPadding: const EdgeInsets.fromLTRB(8, 10, 15, 20),
+          )
+        )
+      )
+    );
+
+    final Rect paddingRect = tester.getRect(find.byType(Padding));
+    final Rect radioRect = tester.getRect(find.byType(radioType));
+    final Rect titleRect = tester.getRect(find.text('Title'));
+
+    // Get the taller Rect of the Radio and Text widgets
+    final Rect tallerRect = radioRect.height > titleRect.height ? radioRect : titleRect;
+
+    // Get the extra height between the tallerRect and ListTile height
+    final double extraHeight = 56 - tallerRect.height;
+
+    // Check for correct top and bottom padding
+    expect(paddingRect.top, tallerRect.top - extraHeight / 2 - 10); //top padding
+    expect(paddingRect.bottom, tallerRect.bottom + extraHeight / 2 + 20); //bottom padding
+
+    // Check for correct left and right padding
+    expect(paddingRect.left, radioRect.left - 8); //left padding
+    expect(paddingRect.right, titleRect.right + 15); //right padding
+  });
 }