docs: single pod service interruption RFC

[andyblog]

Fixes (#1674)

Description
This is a design document that mentions several solutions and their corresponding advantages and disadvantages.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[github-actions]

This PR has been inactive for 14 days. StaleBot will close this stale PR after 14 more days of inactivity.

[github-actions]

This PR has been inactive for 14 days. StaleBot will close this stale PR after 14 more days of inactivity.