feat: add validation feature for row count comparison

Add a validate command that compares row counts between source and target tables after a migration.

internal/app/etl/table_analyzers/postgres.go

@@ -164,11 +164,20 @@ func (ta *PostgresTableAnalyzer) EstimateTotalRows(
 	return 0, nil
 }
 
+func (ta *PostgresTableAnalyzer) QueryMaxMinFromColumn(
+	ctx context.Context,
+	tableInfo config.TableInfo,
+	columnName string,
+) (etl.MaxMinColumnResult, error) {
+	return etl.MaxMinColumnResult{}, nil
+}
+
 func (ta *PostgresTableAnalyzer) CalculatePartitionRanges(
 	ctx context.Context,
 	tableInfo config.TableInfo,
 	partitionColumn string,
 	maxPartitions int64,
+	rangeConstraint config.RangeConfig,
 ) ([]models.Partition, error) {
 	return []models.Partition{}, nil
 }