Update SBS suggest parsing

[awiede]

Summary of Changes

Updates address/unified search result parsing to accommodate the new nested suggestion list in single box search.

Testing Strategy

New schema can be parsed/viewed on the playground:

To Reviewers

Reminder: We embrace the Search team's philosophy and approach to giving code reviews.

Suggestion: Prefix comments with [nit] if you believe they don't block the PR from being able to be merged.

Author's Questions/Concerns

Suggested Review Criteria

To Do Before Merging

• [ ] Ensure all tests pass and all Artifacts build
• [ ] Rebase to latest master
• [ ] Receive at least 1 recent approving review

cc: @mapbox/search-federation