feat(material-experimental/theming): add M3 list support

Author: mmalerba

src/material-experimental/theming/_m3-tokens.scss

@@ -192,6 +192,11 @@
       mdc-tokens.md-comp-list-values($systems, $exclude-hardcoded),
       $token-slots
     ),
+    _namespace-tokens(
+      (mdc, list),
+      mdc-tokens.md-comp-list-values($systems, $exclude-hardcoded),
+      $token-slots
+    ),
     _namespace-tokens(
       (mdc, outlined-card),
       mdc-tokens.md-comp-outlined-card-values($systems, $exclude-hardcoded),