feat(secretmanager): Added samples for tags field

[durgesh-ninave-crest]

Description

Created samples for Global and Regional Secret Manager API

Samples (Global, Regional)

1. Create Secret With Tags
2. Bind Tags to Secret

Ref: https://cloud.google.com/secret-manager/docs/create-and-manage-tags

Checklist

• I have followed guidelines from the CONTRIBUTING.MD
• Appropriate changes to README are included in PR
• Test passed: ../testing/vendor/bin/phpunit test/ -v
• Lint passed: php-cs-fixer fix . --config .php-cs-fixer.dist.php
• These samples need a new API enabled in testing projects to pass (let us know which ones) (To use the tags field, add the SM_TAGS_TESTER label to the Secret Manager service in the project using: tm labels add secretmanager.googleapis.com SM_TAGS_TESTER <project_name> )

Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• secretmanager/src/bind_tags_to_regional_secret.php:28, tag secretmanager_bind_tags_to_regional_secret
• secretmanager/src/bind_tags_to_secret.php:28, tag secretmanager_bind_tags_to_secret
• secretmanager/src/create_regional_secret_with_tags.php:28, tag secretmanager_regional_create_secret_with_tags
• secretmanager/src/create_secret_with_tags.php:28, tag secretmanager_create_secret_with_tags

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[YashSaraf11]

LGTM!