feat: Dual Region Support

[danielbankhead]

[Internal] For details and coordination: go/gcs-dpe-dual-region-milestones

Fixes: #1820
Fixes: #1821

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• samples/createBucketWithDualRegion.js:29, tag storage_create_bucket_dual_region

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[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

[ddelgrosso1]

LGTM