Bump react-native to 0.73.1, expo to 50 (#2214)

* Bump to react-native@0.73, bump expo@next

Includes bumps for all expo deps and dev dependencies. Updates
react-native patch and others, and removes the babel-preset-expo patch.

* Remove duplicate Splash ref

* Bump more deps

* Properly install expo-notifications

* Bump webview dep

* Bump packages according to expo fix; remove pager-view patch as it is no longer needed

* Don't access expo-camera from Web

* Fix crypto dep on web

* Fix some type issues

* Build esnext modules to support dynamic imports

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

babel.config.js

@@ -42,6 +42,7 @@ module.exports = function (api) {
             platform: './src/platform',
             state: './src/state',
             view: './src/view',
+            crypto: './src/platform/crypto.ts',
           },
         },
       ],