fix: include `index_col` when selecting `columns` and `filters` in `read_gbq_table`#648

tswast merged 3 commits intomaingoogleapis/python-bigquery-dataframes:mainfrom

b338111344-fix-index_col-read_gbq_table-to_querygoogleapis/python-bigquery-dataframes:b338111344-fix-index_col-read_gbq_table-to_queryCopy head branch name to clipboard