fix: nodedb find wrong latest version with partial committed batch

[yihuang]

BatchWithFlusher could separate the commit of the same version into multiple batches, when the batches are not persisted atomically, the current latest version method will return an incomplete version and eventually return error in MutableTree.Load(0) method.

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Reviewing files that changed from the base of the PR and between 0e4c40f and 8d1c18d.

📒 Files selected for processing (4)

• CHANGELOG.md (1 hunks)
• batch.go (3 hunks)
• batch_flusher_test.go (1 hunks)
• nodedb.go (1 hunks)

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[mmsqe]

seems they removed dbm.Batch in https://github.com/cosmos/iavl/pull/955/files#diff-367b87ccd372ceca8c6f2e7157b827b4d469318a6571c0cacc99d54c1bb19089

[yihuang]

changed to corestore