avro

AVRO-2863: Create an avro-android artifact (#1347)

* AVRO-2863: Create a shaded jar for Android compatibility

* AVRO-2863: Use MapEntry from outside reflect package

* AVRO-2863: Override ClassValue in the android implmementation

* AVRO-3862: Override ThreadLocal.withInitial in the android implementation

* AVRO-2863: Reorder data members before constructors

* AVRO-2863: Remove unwanted .class file