feat: support autoclass

[shaffeeullah]

Fixes https://github.com/googleapis/nodejs-storage/issues/2053

This should not be merged until the Cloud Storage backend releases the feature. Go ahead is required from @cojenco before merging.

[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

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 2 region tags.

• samples/getAutoclass.js:24, tag storage_get_autoclass
• samples/setAutoclass.js:18, tag storage_set_autoclass

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[shaffeeullah]

@cojenco has approved merging