feat: add information about column total header indexes to DataFrameMetadata

JIRA: CQ-1474
risk: low

Author: Martozar

gooddata-pandas/gooddata_pandas/result_convertor.py

@@ -443,6 +443,7 @@ class DataFrameMetadata:
     """
 
     row_totals_indexes: list[list[int]]
+    column_totals_indexes: list[list[int]]
     execution_response: BareExecutionResponse
     primary_labels_from_index: dict[int, dict[str, str]]
     primary_labels_from_columns: dict[int, dict[str, str]]