Add Core ML conversion

Core ML conversion, task=text2text-generation, precision=float32

coreml/text2text-generation/decoder_float32_model.mlpackage/Data/com.apple.CoreML/weights/weight.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:d26cd822753fb10c22b9ddb3641025d25c587286a273922a6c5f704128e84117
+size 1342178528

coreml/text2text-generation/decoder_float32_model.mlpackage/Manifest.json

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+{
+    "fileFormatVersion": "1.0.0",
+    "itemInfoEntries": {
+        "24489233-0D05-4E43-B16B-534D6560A3FD": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Specification",
+            "name": "model.mlmodel",
+            "path": "com.apple.CoreML/model.mlmodel"
+        },
+        "E0506F55-154C-4F4A-80DE-336231E2737F": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Weights",
+            "name": "weights",
+            "path": "com.apple.CoreML/weights"
+        }
+    },
+    "rootModelIdentifier": "24489233-0D05-4E43-B16B-534D6560A3FD"
+}

coreml/text2text-generation/encoder_float32_model.mlpackage/Data/com.apple.CoreML/weights/weight.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:7da6bbec350825bf288c5f34a66c5948fadec1f900a926905ab00767a7ebd4c5
+size 199088448

coreml/text2text-generation/encoder_float32_model.mlpackage/Manifest.json

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+{
+    "fileFormatVersion": "1.0.0",
+    "itemInfoEntries": {
+        "4C460FCC-8850-4C93-9ECA-12FE3F98D1B2": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Weights",
+            "name": "weights",
+            "path": "com.apple.CoreML/weights"
+        },
+        "FC5A5B72-4465-49EC-833D-3BEDFD958474": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Specification",
+            "name": "model.mlmodel",
+            "path": "com.apple.CoreML/model.mlmodel"
+        }
+    },
+    "rootModelIdentifier": "FC5A5B72-4465-49EC-833D-3BEDFD958474"
+}