Adds 32F disparity support to CUDA DisparityBilateralFilter

[llschloesser]

Pull Request Readiness Checklist

Adds 32F disparity support to CUDA DisparityBilateralFilter. There are no existing tests for this class, but because the function is templated, adding a new type does not break existing functionality.

• [x] I agree to contribute to the project under Apache 2 License.
• [x] 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
• [x] 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.
• [x] The feature is well documented and sample code can be built with the project CMake