[DLP] Implemented samples for inspect on datastore, gcs and bigquery data and send results to SCC

[Avani-Thakker-Crest]

Description

This PR includes 3 samples for inspecting data and send results to SCC and their tests are implemented using mocking approach:

1. inspect_datastore_send_to_scc
2. inspect_gcs_send_to_scc
3. inspect_bigquery_send_to_scc

Fixes #

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Checklist

• 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)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• dlp/snippets/inspect_content.py:1559, tag dlp_inspect_gcs_send_to_scc
• dlp/snippets/inspect_content.py:1663, tag dlp_inspect_datastore_send_to_scc
• dlp/snippets/inspect_content.py:1771, tag dlp_inspect_bigquery_send_to_scc

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[m-strzelczyk]

I see the tests are using capsys - we'd love to move away from using capsys and inspect the return values of methods, but that's a non-blocking comment.