API: External IDs

[Arthi-chaud]

Closes #54

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.82051% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 86.43%. Comparing base (cc69545) to head (418f4bf).

Files	Patch %	Lines
api/api/src/dto/external_id.rs	59.09%	9 Missing ⚠️
api/api/src/guards.rs	96.55%	2 Missing ⚠️
api/api/src/controllers/external_ids.rs	98.07%	1 Missing ⚠️
api/api/src/lib.rs	88.88%	1 Missing ⚠️
api/api/src/services/external_ids.rs	97.91%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   85.83%   86.43%   +0.60%     
==========================================
  Files          35       38       +3     
  Lines        1955     2146     +191     
==========================================
+ Hits         1678     1855     +177     
- Misses        277      291      +14     

Flag	Coverage Δ
api	86.43% <92.82%> (+0.60%)	⬆️

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