Map CSS Typed OM tests to web-features (#51680)

Note that factory-* tests will be part of both features, which is
reasonable since the factory functions are part of CSS Typed OM.

Author: foolip

css/css-typed-om/WEB_FEATURES.yml

@@ -0,0 +1,6 @@
+features:
+- name: css-typed-om
+  files: "**"
+- name: numeric-factory-functions
+  files:
+  - factory-*