Extends GEADD to support independent transposition of both A and C,
matching the behavior of cuBLAS's geam and Apple's Accelerate geadd.
Previously only A could be transposed.
- Add transc parameter across cblas.h, common_interface.h,
common_level3.h, common_param.h
- Add transc handling to interface/geadd.c and interface/zgeadd.c
- Extend kernel/generic/geadd.c and kernel/generic/zgeadd.c with
stride logic for transposed C
- Add transpose test coverage (hand-verified 2x2 cases and randomized
large-matrix tests) for sgeadd, dgeadd, cgeadd, zgeadd
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