chore(migration): Migrate code from googleapis/python-bigquery-dataframes into packages/bigframes#16493

chalmerlowe wants to merge 2227 commits into

maingoogleapis/google-cloud-python:mainfrom

migration.python-bigquery-dataframes.migration.2026-03-31_18-48-47.migrategoogleapis/google-cloud-python:migration.python-bigquery-dataframes.migration.2026-03-31_18-48-47.migrateCopy head branch name to clipboard