perf: Speedup key formatting

[ValarDragon]

This speeds up key formatting, which is by no means the bottleneck, but appeared to be 0.5% of the time of some Osmosis mainnet sync pprof's on IAVL v0 and v1

[coderabbitai]

Walkthrough

The update presents a shift to a more efficient prefixing system within a key formatting package, adjusting key generation and indexing methodologies. It also includes renaming of certain struct fields for clarity and aligns with a new versioning scheme. The changes streamline the process of key manipulation, specifically for benchmarks, and affect how nodes are referenced and stored within the database.

Changes

File(s)	Summary
keyformat/prefix_formatter.go	Introduced FastPrefixFormatter for efficient key prefixing in benchmarks.
node.go	Renamed fields from *NodeKey to *NodeHash and added comments for version clarification.
nodedb.go	Replaced NewKeyFormat with NewFastPrefixFormatter and updated related method calls.

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[ValarDragon]

Driveby comment addition