refactor: updates param types and tests

Release v2.0.6 (googleapis#324)

Release @google-cloud/bigquery v2.0.5 (googleapis#316)

* Release v2.0.5

* update CHANGELOG.md

Release v2.0.4 (googleapis#311)

Release v2.0.3 (googleapis#294)

Release v2.0.2 (googleapis#285)

Release v2.0.1 (googleapis#245)

feat: Release @google-cloud/bigquery v2.0.0 (googleapis#230)

* Release v2.0.0

* update CHANGELOG.md to include latest commits

release: bump v1.0.1 (googleapis#168)

1.3.0 (googleapis#105)