feat: change folders structure (#2319)

# Summary
extract the shared example and use it in example and fabric-example, macos-example

## Test Plan

Run those apps manually.

apps/examples/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "extends": "../../tsconfig.json",
+  "include": ["**/*.ts", "**/*.tsx", "**/*.js"]
+}