Update CUDAMathKernels.cuh

Issue/feature addressed

• Encaspulate CUDAMathKernels kernel launches in unit test in separate .cu file to fix compilation problems due to incompatibility between nvcc and BOOST
• Reactivate CUDAMathKernels boost unit test
• Update dotKernel by using warp level primitive __shfl_down_sync

Proposed solution

Implementation

The implementation of dotKernel is based on

• Implementation based on reduce6 of "Ansorge, R. (2022). Programming in parallel with CUDA: a practical guide. Cambridge University Press."
• https://developer.nvidia.com/blog/using-cuda-warp-level-primitives

Tests

Suggested reviewers

Please suggest any people who would be appropriate to review your code.

Notes

Please add any other information that could be useful for reviewers.

Checklist

• Functions and classes, or changes to them, are documented.
• [ ] User guide/documentation is updated.
• [ ] Changelog is updated.
• Suitable tests added for new functionality.
• Contributed code is correctly formatted. (See the contributing guidelines).
• License added to any new files.
• No extraneous files have been added (e.g. compiler output or test data files).