[#557] Add download endpoint

[SilviaAmAm]

Partly fixes #557

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.16393% with 6 lines in your changes missing coverage. Please review.

Project coverage is 84.36%. Comparing base (60b1664) to head (7bb6987).

Files with missing lines	Patch %	Lines
.../src/openarchiefbeheer/destruction/api/viewsets.py	88.23%	4 Missing ⚠️
backend/src/openarchiefbeheer/destruction/utils.py	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #576      +/-   ##
==========================================
+ Coverage   84.30%   84.36%   +0.05%     
==========================================
  Files         212      212              
  Lines        5716     5775      +59     
  Branches      576      576              
==========================================
+ Hits         4819     4872      +53     
- Misses        897      903       +6     

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