gguf-py : add support for endian conversion of BF16 data (#16594) #22

Job	Run time
macOS-x64	6m 52s
macOS-arm64	4m 0s
windows (vulkan, x64, -DGGML_VULKAN=ON, ggml-vulkan)	5m 54s
ubuntu-22-cpu (x64, ubuntu-22.04)	5m 41s
ios-xcode-build	14m 56s
windows (opencl-adreno, arm64, -G "Ninja Multi-Config" -D CMAKE_TOOLCHAIN_FILE=cmake/arm64-window...	1m 23s
windows-cuda (12.4)	54m 36s
windows-sycl	11m 3s
windows-cpu (arm64)	3m 24s
ubuntu-22-vulkan	8m 33s
windows-cpu (x64)	3m 42s
windows-hip (radeon, gfx1151;gfx1200;gfx1201;gfx1100;gfx1101;gfx1102;gfx1030;gfx1031;gfx1032)	46m 59s
release	1m 17s
	2h 48m 20s

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