Tests

Implement `Step3VLChatHandler` for Step3-VL-10B #63

Job	Run time
build-and-test (macos-14, 3.9, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBRA...	3m 48s
build-and-test (ubuntu-latest, 3.9)	3m 32s
build-and-test (ubuntu-latest, 3.13)	3m 19s
build-and-test (macos-14, 3.13, -DLLAMA_METAL=off, (No Metal))	2m 26s
build-and-test (macos-14, 3.9, -DLLAMA_METAL=off, (No Metal))	2m 39s
build-and-test (ubuntu-latest, 3.14)	3m 23s
build-and-test (windows-latest, 3.13)	8m 43s
build-and-test (macos-14, 3.14, -DLLAMA_METAL=off, (No Metal))	3m 13s
build-and-test (windows-latest, 3.9)	8m 42s
build-and-test (windows-latest, 3.14)	7m 12s
build-and-test (macos-14, 3.14, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	2m 21s
build-and-test (macos-14, 3.13, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	2m 21s
	51m 39s

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