Support models with a single primary key in Model derive macro

[leovalais]

closes #8111

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 94.66019% with 11 lines in your changes missing coverage. Please review.

Project coverage is 81.93%. Comparing base (586b13c) to head (66fe81e).
Report is 76 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/editoast_derive/src/model/parsing.rs	93.26%	7 Missing ⚠️
editoast/src/client/timetables_commands.rs	0.00%	3 Missing ⚠️
editoast/editoast_derive/src/model/args.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10620      +/-   ##
==========================================
+ Coverage   81.83%   81.93%   +0.09%     
==========================================
  Files        1073     1079       +6     
  Lines      107058   107380     +322     
  Branches      728      737       +9     
==========================================
+ Hits        87613    87977     +364     
+ Misses      19406    19363      -43     
- Partials       39       40       +1     

Flag	Coverage Δ
editoast	74.26% <94.66%> (+0.01%)	⬆️
front	89.47% <ø> (+0.10%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	88.14% <ø> (ø)

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[flomonster]

LGTM

[woshilapin]

Thank you for this! Sorry for the delay of the review. A few comments made mostly by you 😛

[leovalais]

Bonus: 2887807