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[Enhancement] Add new matrix multiplication functions and tests for GEMM with transpose options (#331)

- Introduced `matmul_rs` function for flexible matrix multiplication with optional transposition.
- Added `run_gemm_rs` function to facilitate testing of the new matrix multiplication implementation.
- Expanded test coverage for GEMM with additional cases for transposition configurations.
- Corrected index usage in `gemm.h` to ensure proper matrix layout handling.

These changes enhance the GEMM functionality and improve testing capabilities for various matrix configurations.