API to get migration status of a cluster.

[vrogach2020]

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People sometimes forget to do migrations.up() after cluster upgrades. It would be nice to get a flag that all migrations are up to date and possibly display it as an issue in Cartridge UI ifl not all migrations are applied or MD5 of file differs from original. This will also require to compute hash (for example MD5) of each migration and store it when migration is applied successfully.

See for example https://docs.liquibase.com/commands/community/status-verbose.html