Discogs integration - value of collection

hi, can we enhance the discogs integration to support the rest of the information that can be obtained via their api? like the value of the current collection?

it seems that there is support for that: https://www.discogs.com/developers#page:user-collection,header:user-collection-collection-value

CC @thibmaek (thanks for all your work, can you have a look at this?)