[Feature]: Speedup baseapp.GetLastBlockHeight

[ValarDragon]

Summary

In Osmosis, since our upgrade to SDK v50, we have found that baseapp.GetLastBlockHeight has caused significant performance degredation in the mempool.

This is coming from Skip's BlockSDK using GetLastBlockHeight internally, and baseapp using a method that requires re-computing the hash. This is quite easily mitigated performance-wise SDK side, by making the store Committer interface provide a GetLastVersion method, in addition to GetLastCommitInfo method.

Or alternatively, make the store interfaces cache the last CommitInfo rather than re-computing the hash every time.

Problem Definition

No response

Proposed Feature

Either:

• Make the Committer interface have a GetLastVersion field
• Make rootmulti store cache the LastCommitID and not re-compute the hash every time.