feat: Adds type for /keys endpoint

[kirtanchandak]

What

• Adds model names KeyStats for /keys endpoint

[kirtanchandak]

do I need to run the OpenAPI spec file after this change? @CharlesNepote

[CharlesNepote]

do I need to run the OpenAPI spec file after this change? @CharlesNepote

I don't think so, because FastAPI produces the OpenAPI spec file automatically, see https://api.folksonomy.openfoodfacts.org/openapi.json

[CharlesNepote]

Looks good to me, but maybe @VaiTon should confirm these changes provide what he's expecting?

[VaiTon]

Looks good to me, but maybe @VaiTon should confirm these changes provide what he's expecting?

I don't really know how the openapi generator works, but I guess this should be sufficient to make it return a model

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.55%. Comparing base (b9cda65) to head (a0a99a7).
Report is 64 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #230      +/-   ##
==========================================
- Coverage   95.06%   94.55%   -0.52%     
==========================================
  Files           5        5              
  Lines         324      367      +43     
==========================================
+ Hits          308      347      +39     
- Misses         16       20       +4     

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