feat: configure googlevisionapi (#3126)
### Summary
Includes changes from #3117. Merged into a feature branch to run the
full test suite.
Original PR description:
The Google Vision API allows for [configuration of the API
endpoint](https://cloud.google.com/vision/docs/ocr#regionalization), to
select if the data should be sent to the US or the EU. This PR adds an
environment variable (`GOOGLEVISION_API_ENDPOINT`) to configure it.
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Co-authored-by: JIAQIA <jqq1716@gmail.com>
Co-authored-by: Dimitri Lozeve <dimitri@lozeve.com>
