Convert PCL PointTypePose to GTSAM Pose3

This function takes a point of type 'PointTypePose' from the Point Cloud Library (PCL) and converts it into a 'Pose3' object from the GTSAM library.

The input 'thisPoint' contains information about the position and orientation of a point in 3D space. The 'x', 'y', and 'z' fields represent the coordinates of the point, while the 'roll', 'pitch', and 'yaw' fields represent the rotation around the x, y, and z axes respectively.

The function first creates a 'Rot3' object using the 'RzRyRx' constructor, which takes three angles in radians as inputs and returns a rotation matrix. The 'double' conversion is necessary because the 'RzRyRx' constructor expects 'double' arguments.

The 'Pose3' object is then created using the rotation matrix and the point coordinates, which are converted to 'double'. The resulting 'Pose3' object represents the same point in 3D space as the original 'PointTypePose'.