Use Case: Values in JSON-LD are predictable (eg always arrays, never scalars)

[ptsefton]

As a Research Software Engineer, I want the DataCrate manifest to be easy to navigate and parse so that I don't have to write helper functions such as working out whether a value is a scalar or an array.

This means that values should always be arrays apart from the @id.
So rather than:

"@graph": [
    {
      "@id": "/",
      "path": "/",
      "@type": "Dataset",
      "Description": "This data set doesn't really exist"
    }

This should be:

"@graph": [
    {
      "@id": "/",
      "path": ["/"],
      "@type": ["Dataset"],
      "Description": ["This data set doesn't really exist"]
    }

This is in a family with #9 and #10 - designed to make implementation simple.

[ptsefton]

We've decided in discussions that this is not practical.