core: optimize mergeDistanceRangeMaps (use putMany)

[shenriotpro]

fixes #5843

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (687b5fc) 27.30% compared to head (d660a7f) 27.30%.

Files	Patch %	Lines
...main/kotlin/fr/sncf/osrd/utils/DistanceRangeMap.kt	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #6250   +/-   ##
=========================================
  Coverage     27.30%   27.30%           
+ Complexity     2139     2136    -3     
=========================================
  Files           952      952           
  Lines        124899   124900    +1     
  Branches       2689     2690    +1     
=========================================
+ Hits          34105    34106    +1     
  Misses        89189    89189           
  Partials       1605     1605           

Flag	Coverage Δ
core	78.88% <90.00%> (+<0.01%)	⬆️
editoast	75.36% <ø> (ø)
front	9.47% <ø> (ø)
gateway	2.54% <ø> (ø)
tests	81.77% <ø> (ø)

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[eckter]

A few nitpicky comments on the formatting, but other than that LGTM