feat: enable the interval to be updated #159
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This PR makes the snapshot interval updatable. It is important that this is a major release to ensure all protocol validators have this version, since it is a breaking change in case of an interval updating, possibly leading to invalid votes.
Context: The cosmos app always creates snapshots at a certain interval when the block height is divisible without remainder by the interval, to account for that when the interval changes we always search for the next block height in
nextKey
which fits this definition.