Function compute_table_checksum 

pub async fn compute_table_checksum(
    client: &Client,
    schema: &str,
    table: &str,
) -> Result<(String, i64)>

Compute checksum for a table

This generates an MD5 checksum of all data in the table by:

1. Querying all columns in the table
2. Concatenating all column values for each row
3. Ordering by all columns for deterministic results
4. Computing MD5 hash of the aggregated data