Issue #3436546: Add accordion tabs basis

Closes #3436546

modules/vlsuite_layout/modules/vlsuite_layout_tabs/config/schema/vlsuite_layout_tabs.schema.yml

@@ -9,3 +9,17 @@ layout_plugin.settings.vlsuite_layout_tabs_horizontal:
         type: sequence
         sequence:
           type: string
+
+layout_plugin.settings.vlsuite_layout_tabs_accordion:
+  type: vlsuite_layout_base
+  mapping:
+    tabs_always_open:
+      type: boolean
+    tabs_default:
+      type: string
+    tabs:
+      type: sequence
+      sequence:
+        type: sequence
+        sequence:
+          type: string