write to buffer support about fastparquet HOT 2 OPEN

>>> import io
>>> import pandas as pd
>>>
>>> data = [{"x": 1, "y": 2}, {"x": 2, "y": 3}]
>>> df = pd.DataFrame.from_records(data)
>>> 
>>> buffer = io.BytesIO()
>>> df.to_parquet(buffer, engine="fastparquet")
>>> print(buffer.closed)
True
>>> buffer.getvalue() 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: I/O operation on closed file.

>>> buffer2 = io.BytesIO()
>>> df.to_parquet(buffer2) # using the default pyarrow
>>> print(buffer2.closed)
False
>>> buffer2.getvalue() 
b'PAR1\x15\x04\x15 ...