Add CSV export

[carlinmack]

❤️ Thank you for your contribution!

Closes https://github.com/zenodo/rdm-project/issues/633

Description

Please describe briefly your pull request.

Adds support to the API for exporting records as CSV.

inveniosoftware/flask-resources#124 must be merged first
inveniosoftware/invenio-app-rdm#2559 must be merged after if we want the record export button to display

! Still a draft as the schema is currently invalid

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[carlinmack]

Add tests which showcase how the collapse list functions for a full record

-- @zzacharo