cos backend support accelerate

[hellertang]

No description provided.

[hashicorp-cla]

All committers have signed the CLA.

[crw]

Thanks for this submission! Per CODEOWNERS, @likexian is the maintainer for this backend and would need to sign off on the change.

Additionally, I will mention that there is a general hold on backend reviews (see CONTRIBUTING.md#state-storage-backends. That said, if we can get the review from @likexian there is a good likelihood of getting this change merged. Thanks again for the submission!

[likexian]

hello @crw LGTM, please help processing.

[hellertang]

@crw please help processing~

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[crw]

@hellertang Processing complete! If you get a chance, could you please leave a comment explaining the use case for this change, for future readers of this PR? Thanks!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions.
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