Support OR predicate pushdown

WHERE p1 AND p2;

kc = new KuduClient.KuduClientBuilder(kuduMasters).build();
session = kc.newSession();
KuduScanner ks = kc.newScannerBuilder(table).addPredicate(p1).addPredicate(p2).build();

WHERE p1 OR p2;

KuduScanner scanner1 = kc.newScannerBuilder(table).addPredicate(p1).build();
KuduScanner scanner2 = kc.newScannerBuilder(table).addPredicate(p2).build();

while (scanner1.hasMoreRows()) {
    RowResultIterator results = scanner1.nextRows();
    while (results.hasNext()) {
        RowResult rowData = results.next();
        
        //Do stuff with rowData

    }
}

while (scanner2.hasMoreRows()) {
    RowResultIterator results = scanner2.nextRows();
    while (results.hasNext()) {
        RowResult rowData = results.next();
        //Do stuff with rowData

    }
}