[core] Adding rangeBlocksCount to Parallelization

[servantftransperfect]

By adding rangeBlocksCount to parallelization, called nodes have knowledge of the number of parallelized chunks. This enable easier estimation of optimal work partition.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.81%. Comparing base (b5eb9fd) to head (4066f39).
Report is 7 commits behind head on develop.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/core/desc/computation.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2767   +/-   ##
========================================
  Coverage    77.81%   77.81%           
========================================
  Files           48       48           
  Lines         6676     6677    +1     
========================================
+ Hits          5195     5196    +1     
  Misses        1481     1481           

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