Dont import TypeAdapter if we have it, speed up type_adapter call ~4x

Signed-off-by: Nijat Khanbabayev <[email protected]>

Author: NeejWeej

csp/impl/struct.py

@@ -149,12 +149,13 @@ def serializer(val, handler):
 class Struct(_csptypesimpl.PyStruct, metaclass=StructMeta):
     @classmethod
     def type_adapter(cls):
-        # Late import to avoid autogen issues
-        from pydantic import TypeAdapter
-
         internal_type_adapter = getattr(cls, "_pydantic_type_adapter", None)
         if internal_type_adapter:
             return internal_type_adapter
+
+        # Late import to avoid autogen issues
+        from pydantic import TypeAdapter
+
         cls._pydantic_type_adapter = TypeAdapter(cls)
         return cls._pydantic_type_adapter