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

examples/expo/ios/ExpoExample/Images.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,14 @@
+{
+  "images": [
+    {
+      "filename": "App-Icon-1024x1024@1x.png",
+      "idiom": "universal",
+      "platform": "ios",
+      "size": "1024x1024"
+    }
+  ],
+  "info": {
+    "version": 1,
+    "author": "expo"
+  }
+}