fixup! Refactor caching infrastructure and address code review comments

Author: hpopuri2

gateway-ha/src/main/java/io/trino/gateway/ha/cache/Cache.java

@@ -23,8 +23,5 @@ public interface Cache
 
     void invalidate(String key);
 
-    default boolean isEnabled()
-    {
-        return false;
-    }
+    boolean isEnabled();
 }