Improve rootkey cache in pruning: Reduce 4 rootkey fetches to 1 (backport #1029)

[mergify]

Follow on to: #1026

This improves the rootkey cache used in pruning.

It stores two keys now, and its integrated into the traverse calls.

This speedsup the relevant prune logic in osmosis block sync a total of 27% (relative to prior #1026)

Summary by CodeRabbit

• Performance Improvements
  • Enhanced root key caching mechanism to optimize database operations
  • Introduced a two-element cache for more efficient root key retrieval
  • Improved performance of version deletion and orphan traversal processes

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This is an automatic backport of pull request #1029 done by [Mergify](https://mergify.com).

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