Add equirectangular camera model in CameraInit

[servantftransperfect]

Add the model to the list in camera init.

See alicevision/AliceVision#1801

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.90%. Comparing base (aeb77d8) to head (17a0d9f).
⚠️ Report is 499 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2630   +/-   ##
========================================
  Coverage    69.90%   69.90%           
========================================
  Files          121      121           
  Lines         7078     7078           
========================================
  Hits          4948     4948           
  Misses        2130     2130           

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