Add Core ML conversion

Core ML conversion, task=seq2seq-lm, precision=float32

coreml/seq2seq-lm/decoder_float32_model.mlpackage/Data/com.apple.CoreML/weights/weight.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:7724a3cacbcb8fc8578d14d3e046ddb1dd0a97bf434bdee5139655f01882e5c5
+size 232596992

coreml/seq2seq-lm/decoder_float32_model.mlpackage/Manifest.json

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+{
+    "fileFormatVersion": "1.0.0",
+    "itemInfoEntries": {
+        "C85C0DE2-90C5-4C82-A24C-46F4A46DDEE5": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Specification",
+            "name": "model.mlmodel",
+            "path": "com.apple.CoreML/model.mlmodel"
+        },
+        "E37DEFE4-8978-4615-AC84-A7EB12099D5D": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Weights",
+            "name": "weights",
+            "path": "com.apple.CoreML/weights"
+        }
+    },
+    "rootModelIdentifier": "C85C0DE2-90C5-4C82-A24C-46F4A46DDEE5"
+}

coreml/seq2seq-lm/encoder_float32_model.mlpackage/Data/com.apple.CoreML/weights/weight.bin

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+size 141439488

coreml/seq2seq-lm/encoder_float32_model.mlpackage/Manifest.json

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+{
+    "fileFormatVersion": "1.0.0",
+    "itemInfoEntries": {
+        "17521F66-483C-4DAF-8A75-A1B67FE1DE33": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Specification",
+            "name": "model.mlmodel",
+            "path": "com.apple.CoreML/model.mlmodel"
+        },
+        "653E63BF-AEC8-4528-95B1-9819B2D9AB06": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Weights",
+            "name": "weights",
+            "path": "com.apple.CoreML/weights"
+        }
+    },
+    "rootModelIdentifier": "17521F66-483C-4DAF-8A75-A1B67FE1DE33"
+}