storage: enable migration for substores#3412
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Chain operators need to be able to migrate their chain state. Previously, our state model maintained a single merkle tree with a global prefix. With the addition of substores, we now maintain multiple trees for each configured prefix, "mounting" them in the main store (see #3131). To maintain continuity between cometbft block height, compact block height, and merkle tree versions, we need to allow commit to storage that does not increase the state's version. This PR extends support for this type of migration to substores.