Sample for Storage Bucket Notifications

[vishwarajanand]

Goal

Implement four samples:

storage_print_pubsub_bucket_notification
storage_create_bucket_notifications
storage_delete_bucket_notification
storage_list_bucket_notifications

Change Summary

1. Added a new sample for storage_create_bucket_notifications
2. Added tests for the sample in BucketNotificationsTest, will support all storage_*_bucket_notifications samples
3. Added pubsub in composer, otherwise a clean test run will fail.

Tests

➜  storage git:(storage_bucket_notifications) ✗ XDEBUG_MODE=coverage  ../testing/vendor/bin/phpunit --verbose -c phpunit.xml.dist test/BucketNotificationsTest.php
PHPUnit 8.5.23 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.4.28 with Xdebug 3.1.2
Configuration: /usr/local/google/home/vishwarajanand/github/php-docs-samples/storage/phpunit.xml.dist


....                                                                4 / 4 (100%)

Time: 1.66 minutes, Memory: 14.00 MB

OK (4 tests, 7 assertions)

Generating code coverage report in Clover XML format ... done [247 ms]
➜  storage git:(storage_bucket_notifications)

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• storage/src/create_bucket_notifications.php:26, tag storage_create_bucket_notifications
• storage/src/delete_bucket_notifications.php:26, tag storage_delete_bucket_notification
• storage/src/list_bucket_notifications.php:26, tag storage_list_bucket_notifications
• storage/src/print_pubsub_bucket_notification.php:26, tag storage_print_pubsub_bucket_notification

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[bshaffer]

one minor change, otherwise this looks great!

[bshaffer]

Some minor indentation issues, otherwise this looks great