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/build.gradle

@@ -0,0 +1,48 @@
+buildscript {
+    apply(from: {
+        def searchDir = rootDir.toPath()
+        do {
+            def p = searchDir.resolve("node_modules/react-native-test-app/android/dependencies.gradle")
+            if (p.toFile().exists()) {
+                return p.toRealPath().toString()
+            }
+        } while (searchDir = searchDir.getParent())
+        throw new GradleException("Could not find `react-native-test-app`");
+    }())
+
+    repositories {
+        mavenCentral()
+        google()
+    }
+
+    dependencies {
+        getReactNativeDependencies().each { dependency ->
+            classpath(dependency)
+        }
+    }
+}
+
+ext {
+   // For CI builds
+  useExoplayerIMA = System.getenv("RNV_SAMPLE_ENABLE_ADS") ?: false
+}
+
+allprojects {
+    repositories {
+        maven {
+            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
+            url({
+                def searchDir = rootDir.toPath()
+                do {
+                    def p = searchDir.resolve("node_modules/react-native/android")
+                    if (p.toFile().exists()) {
+                        return p.toRealPath().toString()
+                    }
+                } while (searchDir = searchDir.getParent())
+                throw new GradleException("Could not find `react-native`");
+            }())
+        }
+        mavenCentral()
+        google()
+    }
+}