core: stdcm: move java module from api to osrd

[eckter]

This moves files around, nothing else. It was weird that all STDCM related files were in the api module. The endpoint and request/response files stay there and the rest is moved to a new stdcm module at the root of the project.

[codecov]

Codecov Report

Merging #2958 (45f2eef) into dev (53b6a18) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                dev    #2958   +/-   ##
=========================================
  Coverage     38.29%   38.29%           
  Complexity     1713     1713           
=========================================
  Files           600      600           
  Lines         18342    18342           
  Branches       2513     2513           
=========================================
  Hits           7024     7024           
  Misses        10912    10912           
  Partials        406      406           

Flag	Coverage Δ
core	83.88% <ø> (ø)

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

Impacted Files	Coverage Δ
...ain/java/fr/sncf/osrd/api/stdcm/STDCMEndpoint.java	76.92% <ø> (ø)
...a/fr/sncf/osrd/stdcm/BacktrackingEnvelopeAttr.java	100.00% <ø> (ø)
...c/main/java/fr/sncf/osrd/stdcm/OccupancyBlock.java	100.00% <ø> (ø)
.../src/main/java/fr/sncf/osrd/stdcm/STDCMResult.java	100.00% <ø> (ø)
...va/fr/sncf/osrd/stdcm/UnavailableSpaceBuilder.java	94.87% <ø> (ø)
...ava/fr/sncf/osrd/stdcm/graph/AllowanceManager.java	91.89% <ø> (ø)
.../fr/sncf/osrd/stdcm/graph/BacktrackingManager.java	96.77% <ø> (ø)
...in/java/fr/sncf/osrd/stdcm/graph/DelayManager.java	100.00% <ø> (ø)
.../main/java/fr/sncf/osrd/stdcm/graph/STDCMEdge.java	76.47% <ø> (ø)
...ava/fr/sncf/osrd/stdcm/graph/STDCMEdgeBuilder.java	98.68% <ø> (ø)
... and 7 more

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