add date

app/models/research/document.rb

app/models/university/person.rb

app/models/university/person/administrator.rb

app/models/university/person/alumnus.rb

app/models/university/person/author.rb

app/models/university/person/researcher.rb

app/models/university/person/teacher.rb

app/models/university/person/with_research.rb

app/views/admin/research/documents/_list.html.erb

app/views/admin/research/researchers/show.html.erb

...grate/20230114123255_add_hal_url_to_research_documents.rb

...4124148_add_hal_publication_date_to_research_documents.rb

db/migrate/20230114124308_add_doi_to_research_documents.rb

db/schema.rb

test/fixtures/research/documents.yml

test/fixtures/university/people.yml

test/models/research/document_test.rb