Both functions are fully implemented and documented but were tagged
CV_EXPORTS instead of CV_EXPORTS_W, so they were unreachable from
Python (and Java/JS) bindings. They use only bindable types
(InputArrayOfArrays, OutputArray, plain enums), so this is a pure
binding-exposure fix, not a behavior change.
Adds Python regression tests for both functions using synthetic
hand-eye data that satisfies the documented AX=XB (calibrateHandEye)
and AX=ZB (calibrateRobotWorldHandEye) relations, verifying the
recovered transform matches the synthetic ground truth.
Verified locally: built opencv_python3 bindings from this branch and
confirmed cv2.calibrateHandEye / cv2.calibrateRobotWorldHandEye are
now present and both new tests pass against synthetic ground-truth
poses.