Add cookie-banner React example app

Interactive playground with themed banner, headless components,
and debug tabs demonstrating programmatic consent access via
getConsent() across separate bundles.

Signed-off-by: Émile Ré <emile@probo.com>

package.json

@@ -7,7 +7,8 @@
   },
   "workspaces": [
     "apps/*",
-    "packages/*"
+    "packages/*",
+    "examples/*"
   ],
   "scripts": {
     "build": "turbo run build",