Add agency to dois response

[bklaing2]

Purpose

Registration agency is returned in the graphQL response, but not the REST API

Approach

Open Questions and Pre-Merge TODOs

Learning

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

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[codycooperross]

@bklaing2 Can we put this behind a flag? Maybe ?detail=true or something specific to Commons? For the regular REST API response, the agency is redundant, as every returned record is a DataCite DOI. New default values means more documentation and thinking about longterm support viability.