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GetMigrationInfo retrieves a list of migrations applied to the db.

UpdateMigrationInfo inserts a migration entry in the migration info collection.

this is a small internal data layer for the migration utils, may be shared by diff migrators.

MigratorDummy does not actually apply migrations, just inserts the target version into the db to mark the initial/current state.

SimpleMigratior applies migrations by comparing `Version` of migrations passed to Apply() and already applied migrations.

Migration defines an incremental mongo migration step, with a concrete version.

Migrator applies a list of migrations to bring the db up to target version.