Adds support for CUDA MHT 16-bit demosaicking

[llschloesser]

Pull Request Readiness Checklist

This pull request adds support for CUDA 16-bit MHT demosaicking handled identically to 8-bit input. This means the output can be 1, 3, or 4 channels. The same template is used for 8-bit, so there is no need for additional tests unless desired and there is 16-bit test data available.

credit @shane-nichols

• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• [N/A] There is a reference to the original bug report and related work
• [N/A] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• [N/A] The feature is well documented and sample code can be built with the project CMake

[llschloesser]

@asmorkalov I'd like to see these changes merged if you can get to it. We have a 16-bit image processing pipeline for our ROV cameras operating in low-light and due to the size of the images we prefer to use CUDA processing. This debayering method is higher quality that the default linear alternative. If you need a 16-bit raw image for a test I can provide. Thanks!