core: add ETCS SVL logic to ETCS braking simulator

[Erashin]

What's left to do:

• SVL case: compute the minimum between IndicationSvl and IndicationEoa, then maintain speed at dvWarning (4km/h, is minSpeed), then follow indicationEoa, which ends at Eoa, which is the target position (or see how to implement release speed?)
  - compute the minimum envelope between the brakingEnvelopeLOA and brakingEnvelopeEOA (or maybe unneeded and change interface to allow both to be computed one after the other, works as well)

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All modified and coverable lines are covered by tests ✅

Project coverage is 81.59%. Comparing base (675d279) to head (48c5096).
Report is 1 commits behind head on alch/core/add_loa_svl_etcs_logic.

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@@                         Coverage Diff                          @@
##           alch/core/add_loa_svl_etcs_logic   #10402      +/-   ##
====================================================================
- Coverage                             81.64%   81.59%   -0.06%     
====================================================================
  Files                                  1066     1067       +1     
  Lines                                105735   105535     -200     
  Branches                                727      727              
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- Hits                                  86328    86108     -220     
- Misses                                19366    19386      +20     
  Partials                                 41       41              

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editoast	73.61% <ø> (-0.07%)	⬇️
front	89.30% <ø> (-0.04%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.05% <ø> (ø)

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