Tests

Update(MTMDChatHandler): add chunk type helpers #914

Job	Run time
build-and-test (windows-2022, 3.14)	7m 31s
build-and-test (macos-26, 3.14, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	2m 33s
build-and-test (macos-26, 3.9, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBRA...	4m 37s
build-and-test (ubuntu-latest, 3.14)	3m 40s
build-and-test (macos-15-intel, 3.9, -DLLAMA_METAL=off -DCMAKE_OSX_DEPLOYMENT_TARGET=13.3, (No Me...	6m 45s
build-and-test (ubuntu-latest, 3.9)	3m 32s
build-and-test (macos-15-intel, 3.14, -DLLAMA_METAL=off -DCMAKE_OSX_DEPLOYMENT_TARGET=13.3, (No M...	5m 43s
build-and-test (windows-2022, 3.9)	8m 0s
	42m 21s

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