samples: add samples for cloud storage buckets

[feywind]

Fixes: #1742

[snippet-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]

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

[lahuang4]

Looks good overall!

[lahuang4]

Maybe name this createCloudStorageSubscription instead of createSubscriptionWithCloudStorage? Same suggestion applies to the typescript sample.

[feywind]

I picked createSubscriptionWithCloudStorage because the library has five others with that naming scheme from earlier. Unless there's a strong objection, I think I'd probably keep the current name for that reason. Actually, the sample tags are all over the place already, so I don't think I'd want to try to fix it in this PR.

• pubsub_create_cloud_storage_subscription (this one)
• pubsub_dead_letter_create_subscription (createSubscriptionWithDeadLetterPolicy)
• pubsub_create_subscription_with_exactly_once_delivery (createSubscriptionWithExactlyOnceDelivery)
• pubsub_create_subscription_with_filter (createSubscriptionWithFiltering)
• pubsub_enable_subscription_ordering (createSubscriptionWithOrdering)
• createSubscriptionWithRetryPolicy - doesn't seem to have sample tags at all (??)

Maybe for the purposes of this PR, I'll just update the function name to match the tag and leave the filename as-is.