script: add script to download a timetable json from its ID

[eckter]

Fix #10416

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.61%. Comparing base (accd619) to head (3779b39).
Report is 154 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10419      +/-   ##
==========================================
- Coverage   81.62%   81.61%   -0.02%     
==========================================
  Files        1070     1070              
  Lines      105881   105881              
  Branches      727      727              
==========================================
- Hits        86428    86411      -17     
- Misses      19412    19429      +17     
  Partials       41       41              

Flag	Coverage Δ
editoast	73.69% <ø> (-0.06%)	⬇️
front	89.32% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.05% <ø> (ø)

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