convert database DataRow into MigrationType format

[vitaliimelnychuk]

Now, we've responded with Promise<object> from database
https://github.com/WiseEngineering/crispy-cli/blob/master/src/models/migrations.ts#L14-L22

Will be good to have Typescript types like Promise or array of migration

[vitaliimelnychuk]

consider about http://knexjs.org/#typescript-support
looks like it could be helpful even we don't use our database a lot