Support formats with comments for migration files

[KholdStare]

Currently JSON is the only format supported for migration files. It would be nice to have a format that supports comments. Yaml is common even if it has its drawbacks. Since Yaml is a superset of json, every json file should also be a valid yaml file, but can also include comments.

[exekias]

Thank you for opening this issue! it could be nice to support other formats like YAML. My only concern would be around portability, having a common format for everyone makes it easier to document & share knowledge between users.

That said, parsing migration files into the Migration object is a rather thin layer in the CLI, so it may be ok & easy enough to allow other formats.

[KholdStare]

Another option could be jsonnet? https://jsonnet.org/