`insertColumn`: Missing options for `auto-number` columns (string/date prefix)

[simonhammes]

-> https://api.seatable.io/reference/insertcolumn-1

Setting column_data.format to prefix-0000 or YYYYMMDD-0000 is not enough.

The following works on v5.0:

# string prefix
'column_data': {
        'format': '0000',
        'digits': 4,
        'prefix_type': 'string',
        'prefix': 'some-prefix-value',
}

# date prefix
'column_data': {
        'format': '0000',
        'digits': 4,
        'prefix_type': 'date'
}

(I reverse-engineered this by looking at the WS connection data)