Define a field as a complex object

[amelki]

Currently, a field can only have a primitive type (string, string[], boolean).
It should be possible to define some sub-objects and arrays of sub-objects and use them as field types
eg:

{
  pages: [
    home: {
      title: "Home Page",
      seo: {
        keywords: ["foo", "bar", "hux"],
        canonicalUrl: "http://acme.com/home"
      }
    }
  ]
}