Ability for codc to read an ODB file from memory

[TomHodson]

Is your feature request related to a problem? Please describe.

In order to read an ODB from memory, with pyodc you can do something like:

import pyodc, codc
from io import BytesIO

fake_file = BytesIO(b".... raw ODB content ....")
df = pyodc.read_odb(fake_file)

The same trick doesn't work with codc because it expects the input to have the interface of a file on disk, it throws this error:

File ~/git/pyodc/codc/reader.py:21, in Reader.__init__(self, source, aggregated, max_aggregated)
     19 reader = ffi.new("odc_reader_t**")
     20 if isinstance(source, io.IOBase):
---> 21     lib.odc_open_file_descriptor(reader, source.fileno())
     22 else:
     23     assert isinstance(source, str)

UnsupportedOperation: fileno

It would be nice, though perhaps difficult, to modify to C-C++ interface layer to accept a point to a buffer to read from.

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