[TIMOB-11360] Android: Generate package specific R.java

This issue fixes [TIMOB-11360](https://jira.appcelerator.org/browse/TIMOB-11360)

This PR allows users to specify package specific R.java files required
All the developers need to so is add an entry to the manifest
`respackage: com.example.mypackage`
This will generate a corresponding java R file `com.example.mypackage.R.java`