[rocBLAS] scalar vector API option

[TorreZuk]

This pull request adds new API for strided alpha and beta parameters in batched and strided batched GEMV, along with new tests and supporting infrastructure to validate this feature. The changes touch on argument handling, test YAMLs, utility functions, and the GEMV test implementations to enable and verify per-batch striding for these scalar parameters.

Support for strided alpha/beta in GEMV tests:

• Added a new alpha_beta_stride field to the Arguments struct, YAML config, and test infrastructure to enable per-batch striding for alpha and beta parameters.
• Updated GEMV batched and strided batched test implementations to allocate, initialize, and use strided vectors for alpha and beta, and to pass the correct strides to reference and device computations.
• Modified the GEMV test name construction to include stride information when applicable, improving test identification and coverage.

Test infrastructure and utility improvements:

• Added new test and YAML files (set_get_alpha_beta_stride_gtest.cpp and .yaml) to verify the correct setting and getting of batch alpha/beta strides, and integrated them into the test suite and auxiliary test YAMLs.
• Extended the rocblas_local_handle utility to set/reset batch alpha/beta strides based on the new argument.
• Added a utility function rocblas_init_vector_alternating_zero to initialize vectors with alternating zero and a given value, used for alpha/beta initialization in the tests.

Documentation:

• Documented the new batch alpha/beta stride helper functions in the reference documentation.

Test coverage:

• Added new YAML test cases for GEMV with strided alpha/beta, expanding test coverage for this feature.

These changes collectively enable and validate the use of per-batch striding for alpha and beta scalars in GEMV batched operations, improving the flexibility and correctness of the test suite.

ROCM-24002

[codecov-commenter]

Codecov Report

❌ Patch coverage is 73.68421% with 30 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
projects/rocblas/library/src/rocblas_auxiliary.cpp	57.14%	16 Missing and 8 partials ⚠️
projects/rocblas/library/src/include/handle.hpp	50.00%	6 Missing ⚠️

❌ Your project status has failed because the head coverage (69.24%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7507      +/-   ##
===========================================
- Coverage    66.24%   66.24%   -0.00%     
===========================================
  Files         1605     1605              
  Lines       267473   267553      +80     
  Branches     37300    37310      +10     
===========================================
+ Hits        177183   177227      +44     
- Misses       75455    75478      +23     
- Partials     14835    14848      +13     

Flag	Coverage Δ		*Carryforward flag
hipBLAS	90.65% <ø> (ø)		Carriedforward from 1d681ad
hipBLASLt	40.24% <ø> (ø)		Carriedforward from 1d681ad
hipCUB	82.21% <ø> (ø)		Carriedforward from 1d681ad
hipDNN	85.48% <ø> (ø)		Carriedforward from 1d681ad
hipFFT	50.47% <ø> (ø)		Carriedforward from 1d681ad
hipSOLVER	69.24% <ø> (ø)		Carriedforward from 1d681ad
hipSPARSE	85.37% <ø> (ø)		Carriedforward from 1d681ad
rocBLAS	48.12% <73.68%> (+0.01%)	⬆️
rocFFT	48.80% <ø> (ø)		Carriedforward from 1d681ad
rocRAND	57.02% <ø> (ø)		Carriedforward from 1d681ad
rocSPARSE	72.47% <ø> (ø)		Carriedforward from 1d681ad

*This pull request uses carry forward flags. Click here to find out more.

Files with missing lines	Coverage Δ
...las/library/src/blas2/rocblas_gemv_batched_imp.hpp	31.31% <100.00%> (+0.32%)	⬆️
...ary/src/blas2/rocblas_gemv_strided_batched_imp.hpp	32.53% <100.00%> (+0.27%)	⬆️
projects/rocblas/library/src/include/handle.hpp	44.01% <50.00%> (+1.07%)	⬆️
projects/rocblas/library/src/rocblas_auxiliary.cpp	64.08% <57.14%> (-0.74%)	⬇️

... and 5 files with indirect coverage changes

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[TorreZuk]

The _stride form instead of inc with rocblas_stride as types may be the way to go to keep it future proof and consistent with current internal APIs