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/bare/android/settings.gradle

@@ -0,0 +1,21 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        mavenCentral()
+        google()
+    }
+}
+
+rootProject.name = "BareExample"
+
+apply(from: {
+    def searchDir = rootDir.toPath()
+    do {
+        def p = searchDir.resolve("node_modules/react-native-test-app/test-app.gradle")
+        if (p.toFile().exists()) {
+            return p.toRealPath().toString()
+        }
+    } while (searchDir = searchDir.getParent())
+    throw new GradleException("Could not find `react-native-test-app`");
+}())
+applyTestAppSettings(settings)