feat(statesync): extract app version from snapshot

[rootulp]

Closes #3818
Blocked on celestiaorg/celestia-core#1477

Testing

I verified that logs added in this PR show up when state syncing on Mocha. The logs show that the app version provided in the OfferSnapshot ABCI method was plumbed through correctly.

./scripts/mocha.sh
...
2:44PM INF Offering snapshot to ABCI app format=2 hash="$�ڢ�\x1b� �zΊ\x15���`��왹\b^G:\x03+ߢޯ" height=2782000 module=statesync
2:44PM INF offering snapshot app_version=2 height=2782000
2:44PM INF mounting keys for snapshot app_version=2

[rootulp]

This will be ready for review after celestiaorg/celestia-core#1477 merges, I cut a release, bump to it here. 🤞 that fixes golangci-lint too.