perf: remove duplicated rootkey fetch inpruning (9% pruning speedup on osmosis) (backport #1026)

[mergify]

Currently delete version duplicatedly fetches rootkeys. This rootkey fetch does not go through the normal caching logic (as the rootkey fetch call does a direct call to the underlying database. Its not routed through the standard GetNode cache wrappers)

I did a 2 hour long block sync on osmosis, which got through 66000 blocks.
We should cache this root setting logic. Right now root key fetching is ~37% of the block pruning time during my latest sync. And block pruning is 40% of the overall sync time.

This PR does a quick cache to reduce from 4 calls to 3 calls. (TraverseOrphans has 2 calls as well) Ideally we can setup a second cache later on to ensure none of these DB calls get repeated, but for now wanted to keep it simple/uncontroversial with this PR, getting an 9% speedup to pruning's sync time component. (and ~4% to overall block sync)

Summary by CodeRabbit

• New Features

  • Introduced a caching mechanism for root keys to enhance retrieval efficiency.
  • Added methods for managing root key caching, including fetching and updating keys.

• Bug Fixes

  • Optimized version deletion process by reducing database access through caching.

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This is an automatic backport of pull request #1026 done by [Mergify](https://mergify.com).

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