Summary:
Split the yoga buck targets from interface to actual implementation.
This is currently done without moving any files folder, since only we will make the distinction between interface<-->implementation only this buck target (and not in the litho/reactnative yoga copies).
Buck does insures that the `java-interface` is pure since it doesn't depend on any fbjni code.
Reviewed By: SidharthGuglani
Differential Revision: D17266406
fbshipit-source-id: 46aa469b74c2c3114f1d3d762c41d32cfe269f57
e2dbff0ca6