Adding optional mask in plane estimation from point cloud

[rolalaro]

This PR proposes to add an optional mask to the vpPlaneEstimation::estimatePlane method.
The mask is a std::optional<vpImage> that can either be given to the method to ignore some points of the point cloud or be set to nullopt to consider all the points in the RoI (if any) or in the image

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 54.63%. Comparing base (67998e4) to head (1a55cf6).
Report is 106 commits behind head on master.

Files with missing lines	Patch %	Lines
.../vision/src/plane-estimation/vpPlaneEstimation.cpp	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1695      +/-   ##
==========================================
- Coverage   54.63%   54.63%   -0.01%     
==========================================
  Files         447      447              
  Lines       54389    54393       +4     
==========================================
  Hits        29717    29717              
- Misses      24672    24676       +4     

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