[Android] Specify a namespace

[fdrault]

Fix #67

React Native 0.73 will depend on Android Gradle Plugin (AGP) 8.x. This will require all the libraries to specify a namespace in their build.gradle file. We added a compatibility layer for libraries that haven't specified a namespace, but please consider updating your libraries nonetheless.

react-native-community/discussions-and-proposals#671

AGP >=7.3

• Specify a namespace "com.betomorrow.rnfilelogger"
• Package name is removed from new Manifest

AGP < 7.3

• Add compatibility layer for react-native 0.71.
• Manifest contains package name

[alois-beto]

Included in 0.5.7