Tests

Update(MTMDChatHandler): add chunk type helpers #915

Job	Run time
build-and-test (windows-2022, 3.9)	8m 41s
build-and-test (macos-15-intel, 3.9, -DLLAMA_METAL=off -DCMAKE_OSX_DEPLOYMENT_TARGET=13.3, (No Me...	6m 10s
build-and-test (ubuntu-latest, 3.14)	3m 30s
build-and-test (macos-26, 3.9, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBRA...	3m 0s
build-and-test (windows-2022, 3.14)	7m 34s
build-and-test (ubuntu-latest, 3.9)	3m 44s
build-and-test (macos-26, 3.14, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	3m 50s
build-and-test (macos-15-intel, 3.14, -DLLAMA_METAL=off -DCMAKE_OSX_DEPLOYMENT_TARGET=13.3, (No M...	5m 15s
	41m 44s

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