refactor: update RangeConfig to use pointers for min and max; adjust partition calculation logic to handle nil values

internal/app/etl/table_analyzers/postgres.go

@@ -177,6 +177,7 @@ func (ta *PostgresTableAnalyzer) CalculatePartitionRanges(
 	tableInfo config.TableInfo,
 	partitionColumn string,
 	maxPartitions int64,
+	rangeConstraint config.RangeConfig,
 ) ([]models.Partition, error) {
 	return []models.Partition{}, nil
 }