Add CSS interactivity feature

features/interactivity.yml

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+name: interactivity
+description: "The `interactivity: inert` CSS declaration makes an element and its descendants inert, like when using the `inert` HTML attribute. Inert elements can't be focused or clicked, their text can't be selected or found using the browser's find-in-page feature."
+spec: https://drafts.csswg.org/css-ui-4/#inertness
+# Expected keys:
+# - css.properties.interactivity
+# - css.properties.interactivity.auto
+# - css.properties.interactivity.inert

features/interactivity.yml.dist

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+# Generated from: interactivity.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}