[#2762] update settings: log outgoing requests

[pi-sigma]

Closes #2762 (partly)
Depends on maykinmedia/django-log-outgoing-requests

• add settings for saving request & response body
• add celery task + schedule for cleaning up logs

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (3681101) 94.34% compared to head (c579a31) 94.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3074      +/-   ##
==========================================
+ Coverage   94.34%   94.36%   +0.01%     
==========================================
  Files         610      611       +1     
  Lines       19007    19047      +40     
  Branches     2163     2163              
==========================================
+ Hits        17933    17973      +40     
  Misses        783      783              
  Partials      291      291              

Impacted Files	Coverage Δ
src/log_outgoing_requests_ext/tasks.py	100.00% <100.00%> (ø)
src/openforms/conf/base.py	90.86% <100.00%> (+0.28%)	⬆️
src/openforms/conf/ci.py	100.00% <100.00%> (ø)
src/openforms/conf/dev.py	84.78% <100.00%> (+0.33%)	⬆️

... and 3 files with indirect coverage changes

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[pi-sigma]

The error in log_outgoing_requests/log_requests.py, line 24 is caused by a name conflict that's fixed by the complement PR in maykinmedia/django-log-outgoing-requests

[sergei-maertens]

Styling for JSON without newlines is not great yet: