[C++][Python][Dataset] Add total_byte_size metadata to RowGroupInfo #25430
Description
See #7546 (comment).
The row group information in Parquet's FileMetadata includes a "total_byte_size" field. It would be useful to expose this information on the RowGroupInfo object, similarly as we already expose "num_rows".
cc @rjzamora
Reporter: Joris Van den Bossche / @jorisvandenbossche
Assignee: Joris Van den Bossche / @jorisvandenbossche
PRs and other links:
Note: This issue was originally created as ARROW-9346. Please see the migration documentation for further details.