bug: incorrect example in Periodic full reload with CREATE TABLE

the example in iceberg/ingest-from-iceberg#periodic-full-reload-with-create-table is incorrect. Users should always set a primary key in the table definition only like 

```
create table iceberg_batch_table ( primary key (id) ) with (......)
```

Define a table with columns is incorrect.
```
CREATE TABLE iceberg_batch_table (
    id int primary key,
    name varchar
)
```