samples: add samples for cloud storage buckets

[feywind]

Fixes: https://github.com/googleapis/nodejs-pubsub/issues/1742

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 2 region tags.

• samples/createSubscriptionWithCloudStorage.js:32, tag pubsub_create_cloud_storage_subscription
• samples/typescript/createSubscriptionWithCloudStorage.ts:28, tag pubsub_create_cloud_storage_subscription

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[feywind]

It's only one sample for now, this is good to go again.

[generated-files-bot[bot]]

Warning: This pull request is touching the following templated files:

• README.md - README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml
• samples/README.md - samples/README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml