codemeta: Fix incorrect output namespace for dates and URLs

Codemeta reexports schema:url, schema:dateCreated, ... with "@type": "@id" and "type": "schema:Date" so that

{
    "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
    "url": "http://example.org",
    "dateCreated": "2022-10-26"
}

expands to:

{
    "http://schema.org/url": {
        "@type": "@id",
        "@value": "http://example.org"
    },
    "dateCreated": {
        "@type": "http://schema.org/Date",
        "@value": "2022-10-26"
    }
}

However, our translation tried to translate directly to a partially expanded form, like this:

{
    "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
    "url": {
        "@value": "http://example.org"
    },
    "dateCreated": {
        "@value": "2022-10-26"
    }
}

which prevents the compaction and expansion algorithms from adding a type themselves, causing the document to be compacted to:

{
    "@context": "https://doi.org/10.5063/schema/codemeta-2.0",
    "schema:url": "http://example.org"
    "schema:dateCreated": "2022-10-26"
}

or expanded to:

{
    "http://schema.org/url": {
        "@value": "http://example.org"
    },
    "http://schema.org/dateCreated": {
        "@value": "2022-10-26"
    }
}

which are not what we want.

This commit replaces the hack for @type with the right solution that works for all properties.

I noticed this issue while writing tests for the diff that will resolve T4654.

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Migrated from D8778 (view on Phabricator)