Structured (given/sur) names in release contribs

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Creator entities have three fields for human names: display, given, and sur. Release contrib rows currently have only a single field ('raw'), along with an optional reference to a creator entity. The proposed change is to also include full given and sur name fields in the contrib row.

As some context, the overall intent is for fatcat to avoid going down the path of representing "true" human names, and to only represent bibliographic names (aka, what is listed on a published work or in a citation for attribution).

A number of large metadata sources (eg, PubMed) include structured (given/sur) names, and we currently throw this structure away when importing. In the mid-term future, we are only going to have creator entities for a very small fraction of contributions, and this structure may make disambiguation easier in the future, so we should be capturing this full metadata for now.