osrd-railjson: implement toString for LineString / Point

[multun]

No description provided.

[codecov]

Codecov Report

Merging #3588 (7cde472) into dev (7112c54) will decrease coverage by 0.02%.
The diff coverage is 77.77%.

@@             Coverage Diff              @@
##                dev    #3588      +/-   ##
============================================
- Coverage     68.38%   68.36%   -0.02%     
  Complexity     1906     1906              
============================================
  Files           421      421              
  Lines         21217    21220       +3     
  Branches       1540     1540              
============================================
- Hits          14509    14508       -1     
- Misses         5991     5994       +3     
- Partials        717      718       +1     

Flag	Coverage Δ
core	79.17% <77.77%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
.../fr/sncf/osrd/railjson/schema/geom/LineString.java	77.02% <50.00%> (-0.53%)	⬇️
.../java/fr/sncf/osrd/railjson/schema/geom/Point.java	18.18% <50.00%> (+1.51%)	⬆️
...a/fr/sncf/osrd/railjson/schema/infra/RJSInfra.java	100.00% <100.00%> (ø)
...rd/api/pathfinding/response/PathfindingResult.java	100.00% <100.00%> (ø)
...ain/java/fr/sncf/osrd/api/stdcm/STDCMResponse.java	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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