front: add unique map

[clarani]

closes #6019

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 99.10913% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.86%. Comparing base (a0c88c3) to head (79f8a4d).
Report is 8 commits behind head on dev.

Files with missing lines	Patch %	Lines
front/src/common/Map/Layers/IGNLayers/index.ts	0.00%	1 Missing and 1 partial ⚠️
front/src/common/Map/Layers/OSMLayers/index.ts	0.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10722      +/-   ##
==========================================
- Coverage   81.94%   81.86%   -0.08%     
==========================================
  Files        1077     1082       +5     
  Lines      107483   107093     -390     
  Branches      727      729       +2     
==========================================
- Hits        88074    87674     -400     
- Misses      19370    19378       +8     
- Partials       39       41       +2     

Flag	Coverage Δ
editoast	74.30% <ø> (-0.02%)	⬇️
front	89.41% <99.10%> (-0.07%)	⬇️
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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[SharglutDev]

Very nice ! Only some small/nit comments

[kmer2016]

Nice ! Juste small suggestions

[kmer2016]

Good job !

[SharglutDev]

Lgtm and tested, good job !