Skeleton utilities

[digitaldogsbody]

Adds 2 utilities in a new utils folder:

1. Skeleton modifier - this makes the required changes to the existing skeleton file (see Automate Skeleton generation and changes #94)
2. Skeleton regenerator - this downloads the latest JSON Schema from the validator repo, regenerates the Skeleton file, and then runs the modifier

[giacomomarchioro]

I can't remember if we already tried but theoretically, you should be able to generate the data model directly from the URL providing to datamodel-code-gen the --url flag not sure if it's worth a try. That could simplify the deployment.

[helrond]

I fooled around a bit with the --url flag but wasn't able to get it to work.

[digitaldogsbody]

I can't remember if we already tried but theoretically, you should be able to generate the data model directly from the URL providing to datamodel-code-gen the --url flag not sure if it's worth a try. That could simplify the deployment.

I think I prefer to keep it local for now, as we might have to make modifications to the schema before generation in the near future (Glen is experimenting with using an if..then..else structure to improve the behaviour of the validator, but this is not currently supported by datamode-code-generator, which instead outputs an empty models file)