chore: rework examples (#4225)

* remove unused examples

* init bare example with test app

* add react-native-video

* add test app suport in expo plugin

* expo plugin: skip keys that are already in pod file

* fix podfile

* add src files

* fix metro config

* finalize react native test app configuration

* init expo example

* remove old examples

* add guide for example

* Add link to examples apps in docs

* adopt bare example to CI tests

* update CI workflows

* CI build lib after node_modules install

* fix examples readme

* fix iOS CI

* Add Example for DRM

* Update examples/README.md

* fix links

* update examples README

* sync example code

* update README

docs/pages/_meta.json

@@ -17,5 +17,10 @@
     "type": "separator",
     "title": ""
   },
+  "example_apps": {
+    "title": "Example Apps",
+    "newWindow": true,
+    "href": "https://github.com/TheWidlarzGroup/react-native-video/tree/master/examples"
+  },
   "projects": "Useful projects"
 }