Implement personal data archive (Closes #22)

[gwennlbh]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 79.06977% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.51%. Comparing base (f0456ae) to head (79a0b72).
⚠️ Report is 25 commits behind head on master.

Files with missing lines	Patch %	Lines
schoolsyst_api/personal_archive/routes.py	57.14%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   80.52%   85.51%   +4.99%     
==========================================
  Files          34       36       +2     
  Lines         960      994      +34     
==========================================
+ Hits          773      850      +77     
+ Misses        187      144      -43     

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