Issue/feature addressed

This MR tidy-up PhysDeriv CUDA kernels in prevision of future benchmarking tests

Here are a summary of the changes:

• Tidy-up PhysDeriv CUDA kernel implementation
• Fuse kernel functions for better efficiency
• Simplify loops in kernel functions
• Improved coalesced memory access to global memory
• Add templated option for shared memory
• Add 1D indexing version of QP (multilevel) Kernels
• Interleave data for non-QP kernels

To do (future MRs):

• Interleave data for non-QP kernels
• Consider templating nq0, nq1, nq2 parameters
• Optimizing CUDA grid parameters

Proposed solution

Implementation

Tests

Suggested reviewers

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Notes

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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).