Big query insert

[cicdw]

Thanks for contributing to Prefect!

Please describe your work and make sure your PR:

• adds new tests (if appropriate)
• updates CHANGELOG.md (if appropriate)
• updates docstrings for any new functions or function arguments, including docs/outline.toml for API reference docs (if appropriate)

What does this PR change?

Adds a new task to the task library for inserting rows into BigQuery tables.

[jlowin]

This looks great. My only thought is that because this is a BigQuery streaming insert, not an insert DML statement as some might suspect, we should maybe rename the task BigQueryStreamingInsertTask (or similar) to make that clear. Right now the only distinction is the docstring.

This has a larger consequence than just naming because Google charges for streaming inserts, so users should prefer DML or bulk uploads unless they need real-time availability. We could create a separate BigQueryInsertTask that uploaded results from a file (for free).

[cicdw]

Very good point; updated.