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.

jest.config.ts

@@ -1,7 +1,12 @@
 import { Config } from '@jest/types';
 
 const config: Config.InitialOptions = {
-  testPathIgnorePatterns: ['/node_modules/', '/Example/', '/TestsExample/', '/FabricExample/'],
+  testPathIgnorePatterns: [
+    '/node_modules/',
+    '/example/',
+    '/tests-example/',
+    '/fabric-example/',
+  ],
   preset: 'react-native',
   verbose: true,
 };