feat: migrations collection to keep track of migrations

[viniarck]

This is related to #61

#61 (comment)

#61 (comment)

But, let's keep this in the backlog, for now just organizing the scripts into the folders are already very handy, in the future we'll consider introducing a MigrationController which will be responsible for cruding MigrationDoc mentioned in the prior links, and that will be only for newer scripts. So, let's see when it's worth it. At the moment, all of the scripts we have already provides both a write/update and read commands, so, it's relatively great, the only thing we miss the most is the record when it's applied, but most scripts don't cause issues when running again. So, it's not an immediate problem. So, let's keep this part here in the backlog for now cc'ing @Alopalao