Add ?GEMMTR to cblas.h and copy CBLAS_?GEMMT(R) tests from Reference-LAPACK #5634

Job	Run time
build (ubuntu-latest, flang, cmake)	10m 4s
build (macos-latest, gfortran, cmake)	13m 2s
build (ubuntu-latest, gfortran, cmake)	44m 35s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	3m 46s
msys2 (UCRT64, int64, Release)	16m 46s
neoverse_build	8m 0s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	2m 39s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	13m 23s
msys2 (CLANG64, int64, Release)	14m 49s
msys2 (UCRT64, int32, Release)	16m 35s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 37s
build (ubuntu-latest, gfortran, make)	21m 17s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	3m 45s
build (macos-latest, gfortran, make)	11m 20s
msys2 (MINGW32, int32, Release)	18m 45s
msys2 (CLANG64, int32, Release)	16m 40s
build (ubuntu-latest, flang, make)	4m 55s
	3h 43m 58s

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