Source file mapped fields view in Content Onboardingg

How: Add an additional view that only shows the fields from the uploaded source file

Why: Because I want a simple view that only shows me the fields from my source file rather than and few hundred fields form the datamodel and then try to find unmapped fields from the source file

For Who: Content Onboarding users

Impact: Timesaver

Additional context: I don't understand the logic of displaying all fields from the Inriver datamodel (or only mapped/unmapped) as my focus is on a file I'm trying to import with an x-number of columns and I want to be sure that these columns are mapped. I don't want to crawl through the entire field list or having to open the field-selector dropdown to see which fields are still unmapped.

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