[incremental] Java service and shell command handler

Renaming:

IIncrementalManager.aidl -> IIncrementalManagerNative.aidl
IIncrementalServiceProxy.aidl -> IIncrementalManager.aidl

Adding implementation of IIncrementalManager.aidl. Also adding
implementation of the shell command handler.

Test: $adb abb incremental help

Change-Id: Ia18fde097f6170f4774552428a2927186ede8389