Support 0-dimension numpy array write

[phoebusm]

Sample code:

lib.write(symbol="a", data=np.array(0))`

Error:
  File "version_store/_store.py", line 647, in write
    symbol, data, metadata, pickle_on_failure, dynamic_strings, coerce_columns
  File "version_store/_store.py", line 417, in _try_normalize
    raise ArcticNativeException(str(ex))
arcticc.exceptions.ArcticNativeException: 'numpy.float64' object cannot be interpreted as an integer