Add Core ML conversion

Core ML conversion, task=question-answering, precision=float32

coreml/question-answering/float16_model.mlpackage/Data/com.apple.CoreML/model.mlmodel

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+version https://git-lfs.github.com/spec/v1
+oid sha256:12698934bae84794f4d5e77f9cb359e245ecb7849f7881a18c0494642438b500
+size 595573

coreml/question-answering/float16_model.mlpackage/Data/com.apple.CoreML/weights/weight.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:d8dece160d05882e1f65f4331225b8b041423f8e4b79a558eb8d56ffe27ed888
+size 48965184

coreml/question-answering/float16_model.mlpackage/Manifest.json

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+{
+    "fileFormatVersion": "1.0.0",
+    "itemInfoEntries": {
+        "5F839A25-D573-4C6C-8854-CF996A7E2D37": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Specification",
+            "name": "model.mlmodel",
+            "path": "com.apple.CoreML/model.mlmodel"
+        },
+        "693E6AD2-DAFF-4848-BE57-BCA372F5F881": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Weights",
+            "name": "weights",
+            "path": "com.apple.CoreML/weights"
+        }
+    },
+    "rootModelIdentifier": "5F839A25-D573-4C6C-8854-CF996A7E2D37"
+}

coreml/question-answering/float32_model.mlpackage/Data/com.apple.CoreML/model.mlmodel

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8bf3309791c699017af36495b904428cc54bfe8376fd1b6e717c6aa22b9d94d4
+size 548806

coreml/question-answering/float32_model.mlpackage/Data/com.apple.CoreML/weights/weight.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:3d6ad55e333b0fa4030af340f46c276e71753f637770cffb0e000dc26e2d4592
+size 97860672

coreml/question-answering/float32_model.mlpackage/Manifest.json

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+{
+    "fileFormatVersion": "1.0.0",
+    "itemInfoEntries": {
+        "92CA4CA6-B831-40EE-8B3C-9F0DEA25EE89": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Weights",
+            "name": "weights",
+            "path": "com.apple.CoreML/weights"
+        },
+        "CABB7989-15AF-41E2-B7EC-B99C39033A1A": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Specification",
+            "name": "model.mlmodel",
+            "path": "com.apple.CoreML/model.mlmodel"
+        }
+    },
+    "rootModelIdentifier": "CABB7989-15AF-41E2-B7EC-B99C39033A1A"
+}