front: create itinerary reducer

[clarani]

To merge after #10194

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 79.56989% with 19 lines in your changes missing coverage. Please review.

Project coverage is 81.42%. Comparing base (663a418) to head (160aedf).

Files with missing lines	Patch %	Lines
...srdconf/operationalStudiesConf/itineraryReducer.ts	40.00%	12 Missing ⚠️
...ucers/osrdconf/operationalStudiesConf/selectors.ts	76.00%	6 Missing ⚠️
...nt/src/modules/pathfinding/hooks/usePathfinding.ts	66.66%	1 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10205      +/-   ##
==========================================
- Coverage   81.44%   81.42%   -0.02%     
==========================================
  Files        1058     1059       +1     
  Lines      104275   104296      +21     
  Branches      723      721       -2     
==========================================
+ Hits        84923    84926       +3     
- Misses      19310    19328      +18     
  Partials       42       42              

Flag	Coverage Δ
editoast	73.57% <ø> (-0.05%)	⬇️
front	89.17% <79.56%> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.