:sparkles: [#133] Implement streaming/downloading file content

[sergei-maertens]

Fixes #133

Changes

• The binary content of the uploaded document is streamed down directly from the upstream Documenten API.
• Upstream errors are transformed into HTTP 502 errors on our end
• Downloads are audit logged

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ
src/woo_publications/api/exceptions.py	100.00% <100.00%> (ø)
src/woo_publications/logging/constants.py	100.00% <100.00%> (ø)
src/woo_publications/logging/logevent.py	97.36% <100.00%> (+0.14%)	:arrow_up:
src/woo_publications/logging/service.py	100.00% <ø> (ø)
src/woo_publications/publications/api/viewsets.py	100.00% <100.00%> (ø)
src/woo_publications/publications/models.py	100.00% <100.00%> (ø)