Virtual Input

[ggpwnkthx]

Core changes made so that virtual field types can now handle generic JSON input values that can be used by their respective hooks.

The virtual-field example has also been updated to show the use case of where Tag records, as they relate to Post records, are orderable. The tags field of the Post list will output the Tag records in the order specified by first querying the explicit relationship list, PostTags. If an array of Tag records are provided in the tags field of a Post mutation, whatever order they are in is how they will be reordered for that Post.

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[dcousens]

I don't know if virtual is the right abstraction for this, and JSON is too opinionated. I don't think I can accept this pull request, but I will tag you in any related work. :yellow_heart: