Add filterable library-specific subsets in a future-proof way

[Haroenv]

const packageDetail = {
  ...otherKeys,
  subset: {
    babel: "6",
    "angular-cli": "/path-to/scaffold"
    "gatsby": "component"
  }
}

Now I should still check how we can easily make it facetable, I'm not sure if putting it like this will allow that. An idea I had to solve that was this:

const packageDetail = {
  ...otherKeys,
  subset: {
    "keys": ["babel", "angular-cli", "gatsby"],
    babel: "6",
    "angular-cli": "/path-to/scaffold"
    "gatsby": "component"
  }
}

In this case only the subset.keys would be facetable, but it would mean that we can't use the name keys for any of the subsets (seems fine for me).

[Haroenv]

To be clear, this is to prevent the status quo of overloading keywords with this info.

For example: babel wants to have all packages with a specific type of name, angular wants those with package.json#scaffold, Gatsby wants specific keywords/names.

This will allow the extra information they want, be it a string or an object, to be in line with what the data is used for.

  const packageDetail = {
    ...otherKeys,
-   keywords: [...originalKeywords, ?babelKeyword, ?gatsbyKeyword ...],
+   subset: {
+     "keys": ["babel", "angular-cli", "gatsby"],
+     babel: "6",
+     "angular-cli": "/path-to/scaffold"
+     "gatsby": "component",
+   },
}