feat:add samples for annotations, SM

[vipul7499]

Description

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

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 6 region tags.

• secretmanager/snippets/create_secret_with_annotations.py:20, tag secretmanager_create_secret_with_annotations
• secretmanager/snippets/edit_secret_annotations.py:16, tag secretmanager_edit_secret_annotations
• secretmanager/snippets/regional_samples/create_regional_secret_with_annotations.py:20, tag secretmanager_create_regional_secret_with_annotations
• secretmanager/snippets/regional_samples/edit_regional_secret_annotations.py:16, tag secretmanager_edit_regional_secret_annotations
• secretmanager/snippets/regional_samples/view_regional_secret_annotations.py:19, tag secretmanager_view_regional_secret_annotations
• secretmanager/snippets/view_secret_annotations.py:19, tag secretmanager_view_secret_annotations

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