Add _collection to all data, sibilingData, doc etc

[ssyberg]

I wasn't quite sure how to search for if this has already been requested, but I've found when building reusable fields/hooks/etc that not knowing the underlying collection type for the data I'm working with is a frequent issue. I haven't wanted to address this so I end up passing this data around all over the place and it's feeling increasingly brittle.

I'm ambivalent as to if this should just be injected into responses all over the place or if it should actually be stored in the database (seems kinda silly but idk). If there's already a patter for injecting attributes into data, doc, sibilingData etc that would probably be my vote.