Update on "[executorch][serialization] Rename scalar_type.fbs --> common.fbs"

Allow us to add other shared flatbuffer types into `common.fbs`.

- Rename scalar_type.fbs --> common.fbs
- Rename scalar_type.py --> common_schema.py (differentiate from exir/common.py)

Differential Revision: [D65442256](https://our.internmc.facebook.com/intern/diff/D65442256/)

[ghstack-poisoned]

Author: lucylq

exir/TARGETS

@@ -40,6 +40,14 @@ python_library(
     ],
 )
 
+# Deprecated in ExecuTorch v0.5
+python_library(
+    name = "scalar_type",
+    srcs = [
+        "scalar_type.py",
+    ],
+)
+
 python_library(
     name = "common_schema",
     srcs = [

exir/scalar_type.py

@@ -0,0 +1,11 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+# pyre-unsafe
+
+from executorch.exir.common_schema import ScalarType  # noqa [F401] 'executorch.exir.common_schema.ScalarType' imported but unused
+import warnings
+warnings.warn("executorch.exir.scalar_type is deprecated and will be removed in a future release. Please use executorch.exir.common_schema instead", DeprecationWarning)