introduce web_components pkg for consolidated polyfills

pkg/shadow_dom/lib/shadow_dom.min.js

Index: pkg/shadow_dom/lib/shadow_dom.min.js
diff --git a/pkg/shadow_dom/lib/shadow_dom.min.js b/pkg/shadow_dom/lib/shadow_dom.min.js
deleted file mode 100644
index c4c13c8ffd4c94f0e98419d9d8a02e88bf217235..0000000000000000000000000000000000000000
--- a/pkg/shadow_dom/lib/shadow_dom.min.js
+++ /dev/null
@@ -1,3 +0,0 @@
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