As a developer I would like to manipulate values of fields property in the contentCreateStruct structure

Implemented getter and setter methods for the fields property of contenCreateStruct structure.
By making these changes I'm able to create a new content and update its fields using JS Rest Client.
https://jira.ez.no/browse/EZP-23276
same remark as above, use `fieldIdentifier` in both the method signature and the comment.