feat: add stats for each field

read the record batches from arrow files in staging directory
run datafusion queries to fetch count, distinct count
and count for each distinct values for all fields in the dataset

store in <dataset>_pmeta dataset

UI to call below SQL query to fetch the stats from this dataset-

```
SELECT
    field_name,
	field_count
	distinct_count,
    distinct_value,
    distinct_value_count
FROM (
    SELECT
        field_stats_field_name as field_name,
        field_stats_distinct_stats_distinct_value as distinct_value,
        SUM(field_stats_count) as field_count, field_stats_distinct_count as distinct_count,
         SUM(field_stats_distinct_stats_count) as distinct_value_count,
        ROW_NUMBER() OVER (
            PARTITION BY field_stats_field_name
            ORDER BY SUM(field_stats_count) DESC
        ) as rn
    FROM <dataset>_pmeta
    WHERE field_stats_field_name = 'status_code'
      AND field_stats_distinct_stats_distinct_value IS NOT NULL
    GROUP BY field_stats_field_name, field_stats_distinct_stats_distinct_value, field_stats_distinct_count
) ranked
WHERE rn <= 5
ORDER BY field_name, distinct_value_count DESC;
```

Author: nikhilsinhaparseable