Support FixedSizeListArray inputs

[hombit]

Feature request

It would be great if we could support fixed-list-array input, maybe casting them into "normal" list-arrays. Example of a failure

import nested_pandas as npd

npd.read_parquet(
    'https://huggingface.co/datasets/MultimodalUniverse/desi/resolve/main/edr_sv3/train-00003-of-00007.parquet?download=true'
)

...
File ~/projects/lincc-frameworks/nested-pandas/src/nested_pandas/series/utils.py:78, in validate_struct_list_array_for_equal_lengths(array)
     76     continue
     77 # compare offsets from the first list array with the current one
---> 78 if not first_list_array.offsets.equals(list_array.offsets):
     79     raise ValueError("Offsets of all ListArrays must be the same")

AttributeError: 'pyarrow.lib.FixedSizeListArray' object has no attribute 'offsets'

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