[#13] Add prettyfier based on content-type

[vaszig]

Fixes #13

Added Prettify button in the admin change view, to get a better view of the output only if it is 'XMLorJSON`.

es: XML

es: JSON

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.94%. Comparing base (1d1b877) to head (d868a15).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
log_outgoing_requests/admin.py	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
- Coverage   97.75%   95.94%   -1.81%     
==========================================
  Files          21       22       +1     
  Lines         445      469      +24     
  Branches       57       30      -27     
==========================================
+ Hits          435      450      +15     
- Misses          6       14       +8     
- Partials        4        5       +1     

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[danielmursa-dev]

I changed @vaszig initial idea a bit, to create a views and also the urls to prettify body_response in another view, because I thought it would be better to stay on the same view and only with JS to show or hide prettify_body_response

[alextreme]

Nice, thanks Daniel! Will let Steven review