Support typed exceptions with dynamodb-local.

The value of the __type key in body of the error responses from dynamodb
local does not have the com.amazonaws.dynamodb.v20120810# prefix.

An example of a ConditionalCheckFailedException:

```
{"__type": "ConditionalCheckFailedException", "message": "The conditional request failed"}
````

src/aiodynamo/errors.py

@@ -207,7 +207,7 @@ def exception_from_response(status: int, body: bytes) -> Exception:
  return ServiceUnavailable()
  try:
  data = json.loads(body)
- error = ERRORS[data["__type"].split("#", 1)[1]](data)
+ error = ERRORS[data["__type"].split("#", 1)[-1]](data)
  if isinstance(error, TransactionCanceled):
  error = extract_error_from_transaction_canceled(data)
  return error
@@ -220,4 +220,4 @@ def extract_error_from_transaction_canceled(data: Dict[str, Any]) -> AIODynamoEr
  error = data["CancellationReasons"][0]
  return ERRORS[f"{error['Code']}Exception"](error["Message"])
  except Exception:
- return ERRORS[data["__type"].split("#", 1)[1]](data)
+ return ERRORS[data["__type"].split("#", 1)[-1]](data)

tests/unit/test_errors.py

@@ -30,14 +30,16 @@ async def request(self, *args: Any, **kwargs: Any) -> AsyncIterator[None]:
  await client.get_item("test", {"a": "b"})
 
 
-async def test_dynamo_errors_get_raised_depaginated() -> None:
+# dynamodb-local does non include the #-prefixed value
+@pytest.mark.parametrize("error_type", ["ValidationException", "com.amazonaws.dynamodb.v20120810#ValidationException"])
+async def test_dynamo_errors_get_raised_depaginated(error_type: str) -> None:
  class TestResponse:
  status = 400
 
  async def read(self) -> bytes:
  return json.dumps(
  {
- "__type": "com.amazonaws.dynamodb.v20120810#ValidationException",
+ "__type": error_type,
  "message": "test",
  }
  ).encode()