fix(android): ads build and enable ads in android sample (#3376)

* fix: refactor androidx core version management

* chore: fix missing import rework for media3

* fix: enable IMA in sample

* chore: rename stub fie

* chore: code review, fix variable name

* chore: reorder imports

* chore: fix linking in sample

* chore: fix stub management

* chore: few cleans and ensure we don't use ima is disabled

---------

Co-authored-by: olivier <olivier.bouillet@ifeelsmart.com>

examples/basic/android/build.gradle

@@ -6,10 +6,12 @@ buildscript {
         minSdkVersion = 21
         compileSdkVersion = 33
         targetSdkVersion = 33
-        kotlinVersion = "1.6.20"
+        kotlinVersion = "1.8.0"
 
         // We use NDK 23 which has both M1 support and is the side-by-side NDK version from AGP.
         ndkVersion = "23.1.7779620"
+
+        RNVUseExoplayerIMA = true
     }
     repositories {
         google()