* Add initial earn claim migrations
* Use existing types for migrations, add accural time migrations
* Add MigrateRewardIndexes
* Delete old state after migration
* Update store test with multiple entries
* Move key methods to keys.go
* Update incentive consensus version to 3
* Call MigrateRewardIndexes in main migration, remove debugging statements
* Fix migration version to v3
* Update module versions
* Update outdated v1 comment
