Add BigQuery Remote Vision Function code sample

[autoerr]

Description

First sample for #8425

Checklist

• Before submitting a pull request, please open an issue for discussion if you are not associated with Google.
• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• Please merge this PR for me once it is approved.

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• bigquery/remote-function/vision/vision_function.py:15, tag bigquery_remote_function_vision

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[engelke]

LGTM, see comments in nox file, but don't consider them blocking if you disagree with them.

[dandhlee]

Could you add yourself as the owner for the sample here? https://github.com/GoogleCloudPlatform/python-docs-samples/blob/main/.github/CODEOWNERS

A team is preferred if there is one!

@shollyman, could you take a look as BQ owner?

[dandhlee]

Thank you! Approving for CODEOWNERS.

Adding do not merge until BQ approval is obtained.