Add `data-diff` Support for Athena

[terzioglub]

Athena is missing GetTableSummary method implementation, preventing it from using the bruin data-diff command. Currently only postgres, bigquery, snowflake, and duckdb support data-diff.
More about data-diff on : https://getbruin.com/docs/bruin/commands/data-diff.html

The GetTableSummary method analyzes a table's schema and data statistics to enable comparison between tables. It returns column information (types, constraints) and statistical data (row counts, null counts, min/max values, averages) that bruin data-diff uses to identify differences between tables.

Implementation

Add GetTableSummary method for the database . Postgres , bigquery , duckdb already implements functions take a look at these packages db.go to get an idea of the implementation

func (db *DB) GetTableSummary(ctx context.Context, tableName string, schemaOnly bool) (*diff.TableSummaryResult, error) {
    // Follow pattern from pkg/postgres/db.go or pkg/duckdb/db.go
    // Return table statistics for data comparison
}

Acceptance Criteria

• GetTableSummary method implemented in pkg/athena/db.go
• bruin data-diff works for blockhouse
• Schema comparison works (column types, nullable, constraints)
• Data comparison works (row counts, column statistics)
• --schema-only flag works
• Test cases