Add distilgpt2 for text-generation

coreml/text-generation/float32_logits_model.mlpackage/Data/com.apple.CoreML/model.mlmodel

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+version https://git-lfs.github.com/spec/v1
+oid sha256:480410475e99e761aa0f5dadac60b8347dca1e9b318d22c2dfcb97744f725b07
+size 1240242

coreml/text-generation/float32_logits_model.mlpackage/Data/com.apple.CoreML/weights/weight.bin

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+version https://git-lfs.github.com/spec/v1
+oid sha256:cd9e45e53651a247be8fdfa1b9003981ecc354b278ac02e14aa60e4da2d6d4e6
+size 484212356

coreml/text-generation/float32_logits_model.mlpackage/Manifest.json

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+{
+    "fileFormatVersion": "1.0.0",
+    "itemInfoEntries": {
+        "23967264-688e-4dbd-b909-8c9043a90909": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Weights",
+            "name": "weights",
+            "path": "com.apple.CoreML/weights"
+        },
+        "325fbf92-b338-438e-82d1-f90cee014fbd": {
+            "author": "com.apple.CoreML",
+            "description": "CoreML Model Specification",
+            "name": "model.mlmodel",
+            "path": "com.apple.CoreML/model.mlmodel"
+        }
+    },
+    "rootModelIdentifier": "325fbf92-b338-438e-82d1-f90cee014fbd"
+}