Add additional hand images

[sktometometo]

Add additional hand images hand_color_in_hand_depth_frame, hand_depth_in_hand_color_frame so that point cloud can be genereted with depth_image_proc

[k-okada]

Are you tring to process depth image? if you simply would like to get 3d pose of the image, plesae check to see if spot-sdk already provide the service.
If you would like to get 3d pose of detected object, please consider using https://github.com/k-okada/spot_ros-arm/blob/arm/spot_driver/scripts/ncb_provider and https://github.com/k-okada/jsk_robot/blob/spot_arm/jsk_spot_robot/jsk_spot_startup/launch/include/perception.launch

[sktometometo]

I want to detect the top plane of a table. For this, we already have detection pipeline based of jsk_pcl_ros. So I want to use PointCloud2 message to reuse it.

[sktometometo]

@k-okada There are some users already for this PR. So could you review this?

See the pose of @a-ichikura at Spot space of Google Chat.

[sktometometo]

Thanks!