Fix issue #28407: cv::cuda::resize fails with continuous GpuMat

[0AnshuAditya0]

Summary

Fixes issue where cv::cuda::resize fails with error "invalid argument in function 'createTextureObject'" when using GpuMat created via cv::cuda::createContinuous().

Root Cause

• CUDA texture objects require properly aligned pitch values
• createContinuous() GpuMat may have pitch that doesn't meet alignment requirements
• Previous code only handled single row/column cases, not invalid pitch

Changes

• texture.hpp: Added validation to check if step/pitch meets CUDA requirements
• test_resize.cpp: Added regression test ResizeContinuous that verifies:
  • Regular GpuMat works (baseline)
  • Continuous GpuMat works (previously failed)
  • Both produce identical results

Testing

• Test covers multiple sizes (10x10, 64x64, 128x128)
• Multiple data types (CV_8UC1, CV_8UC3, CV_32FC1)
• Multiple interpolation methods (NEAREST, LINEAR, CUBIC)

Fixes opencv/opencv#28407

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• 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
• There is a reference to the original bug report and related work
• There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• The feature is well documented and sample code can be built with the project CMake