Add management command for downloading paper PDFs

[gzurowski]

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 76.11%. Comparing base (15f06d1) to head (284a3ab). :warning: Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2775   +/-   ##
=======================================
  Coverage   76.11%   76.11%           
=======================================
  Files         498      498           
  Lines       26778    26778           
=======================================
  Hits        20381    20381           
  Misses       6397     6397           

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud