Example app update (callstack#434)

* Transform prettier config to use JSON instead of JS

* Update react-native to 0.70.1

* Avoid including specific example implementation files

* Remove redundant presets from babel config

* Update package lockfile regarding postinstall script

* Update Pods regarding react-native update

* Revert "Avoid including specific example implementation files"

This reverts commit f040be7.

* Update locks regarding Hermes engine

* Reorganize example source structure

* Fix the incorrect event used for Sliding Start example

example/.prettierrc.json

@@ -0,0 +1,7 @@
+{
+  "arrowParens": "avoid",
+  "bracketSameLine": true,
+  "bracketSpacing": false,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

example/babel.config.json

@@ -1,3 +1,3 @@
 {
-    "presets": ["module:metro-react-native-babel-preset", "babel-preset-expo"]
+    "presets": ["module:metro-react-native-babel-preset"]
 }

example/index.ts

@@ -3,7 +3,7 @@
  */
 
 import {AppRegistry} from 'react-native';
-import App from './App';
+import App from './src/App';
 import {name as appName} from './app.json';
 
 AppRegistry.registerComponent(appName, () => App);