HHH-12692 SessionImpl#toString - add system identity hashcode

show the instance id in addition to whether the session is open or closed (when trace is not enabled).

hibernate-core/src/main/java/org/hibernate/internal/SessionImpl.java

@@ -2314,7 +2314,7 @@ public final class SessionImpl
 	@Override
 	public String toString() {
 		StringBuilder buf = new StringBuilder( 500 )
-				.append( "SessionImpl(" );
+				.append( "SessionImpl(" ).append(System.identityHashCode(this));
 		if ( !isClosed() ) {
 			if(TRACE_ENABLED) {
 			buf.append( persistenceContext )