feat: add expo plugins (#3933)

* feat: add expo plugins

* add export

* fix import

* fix bugs

* build `lib` to `CommonJS`

* restore `build.gradle`

* remove plugin tmp

* add expo plugin for ios caching

* add docs for expo plugin

* fix expo plugin export

* fix docs

docs/pages/installation.md

@@ -49,6 +49,8 @@ To enable google IMA usage define add following line in your podfile:
 $RNVideoUseGoogleIMA=true
 ```
 
+**If you are using Expo you can use [expo plugin](other/expo.md) for it**
+
 </details>
 <details>
 <summary>Android</summary>
@@ -67,6 +69,8 @@ buildscript {
 
 ### Enable custom feature in gradle file
 
+**If you are using Expo you can use [expo plugin](other/expo.md) for it**
+
 You can disable or enable the following features by setting the following variables in your `android/build.gradle` file:
 - `useExoplayerIMA` - Enable Google IMA SDK (Ads support)
 - `useExoplayerRtsp` - Enable RTSP support