Added support for new publisher object in graphql

[bklaing2]

Purpose

Adds support for the new publisher objected to GraphQL. When querying a work, publisher is now queried as

publisher {
  name
  publisherIdentifier
  publisherIdentifierScheme
  schemeUri
  lang
}

closes: datacite/akita#310 #1013

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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