update: implement CacheWithRemove interface in DefaultLRUCache class

Author: FarhanAnjum-opti

core-api/src/main/java/com/optimizely/ab/internal/DefaultLRUCache.java

@@ -23,7 +23,7 @@
 
 import com.optimizely.ab.annotations.VisibleForTesting;
 
-public class DefaultLRUCache<T> implements Cache<T> {
+public class DefaultLRUCache<T> implements CacheWithRemove<T> {
 
     private final ReentrantLock lock = new ReentrantLock();