Make canRetryOn function public. (#764)

* Make canRetryOn function public.

Make it static and rename it to isRetryable.
To be used as experimental API.

* Fix compile issue

Co-authored-by: Gregory Woods <[email protected]>

Author: gjmwoods

driver/src/main/java/org/neo4j/driver/internal/retry/ExponentialBackoffRetryLogic.java

@@ -45,6 +45,7 @@
 import org.neo4j.driver.exceptions.TransientException;
 import org.neo4j.driver.internal.util.Clock;
 import org.neo4j.driver.internal.util.Futures;
+import org.neo4j.driver.util.Experimental;
 
 import static java.util.concurrent.TimeUnit.SECONDS;
 
@@ -147,6 +148,12 @@ public <T> Publisher<T> retryRx( Publisher<T> work )
     }
 
     protected boolean canRetryOn( Throwable error )
+    {
+        return isRetryable( error );
+    }
+
+    @Experimental
+    public static boolean isRetryable( Throwable error )
     {
         return error instanceof SessionExpiredException || error instanceof ServiceUnavailableException || isTransientError( error );
     }