Added stereo calibration using charuco board (backport #976)

[mergify]

From #972
Doing this first for rolling.

This was a TODO in the repository, opening this PR to add this feature.

• The main issue why this wasn't possible imo is the way mk_obj_points works. I'm using the inbuilt opencv function to get the points there.
• The other is a condition when aruco markers are detected they are added as good points, This is fine in case of mono but in stereo these have to be the same number as the object points to find matches although this should be possible with aruco.

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  This is an automatic backport of pull request Added stereo calibration using charuco board #976 done by Mergify.

[mergify]

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	both modified:   camera_calibration/src/camera_calibration/calibrator.py

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