Revert "Revert "Migrate Collator classes to use ICU4J.""

The SDK build is now fixed by adding icu4j as a dependency of docs.

This reverts commit 5fc822e7ef47448adccd73ca2ebbd28a068f5136.

Change-Id: Ibac9b40189a83323e5175e8ea26c973eb07bc34f
15 files changed