Unable to collect slices or masks of Parquet with nested data spanning across more than one data page

[coastalwhite]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

import polars as pl
import pyarrow.parquet as pq
import io

width = 4100
df = pl.DataFrame([
    pl.Series('a', [
        [i for i in range(width)],
        [i for i in range(width)],
    ], pl.Array(pl.Int64, width)),
])

f = io.BytesIO()
pq.write_table(
    df.to_arrow(),
    f,
    use_dictionary=False,
    data_page_size=1024,
    column_encoding={ 'a': 'PLAIN' },
)

f.seek(0)
print(pl.read_parquet(f, n_rows=1))

Log output

thread '<unnamed>' panicked at crates/polars-parquet/src/arrow/read/deserialize/mod.rs:78:22:
called `Result::unwrap()` on an `Err` value: ComputeError(ErrString("values (of len 4096) must be a multiple of size (4100) in FixedSizeListArray."))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Traceback (most recent call last):
  File "/home/johndoe/Projects/polars/repro.py", line 23, in <module>
    print(pl.read_parquet(f, n_rows=1))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/johndoe/Projects/polars/py-polars/polars/_utils/deprecation.py", line 91, in wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/johndoe/Projects/polars/py-polars/polars/_utils/deprecation.py", line 91, in wrapper
    return function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/johndoe/Projects/polars/py-polars/polars/io/parquet/functions.py", line 170, in read_parquet
    return _read_parquet_binary(
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/johndoe/Projects/polars/py-polars/polars/io/parquet/functions.py", line 257, in _read_parquet_binary
    pydf = PyDataFrame.read_parquet(
           ^^^^^^^^^^^^^^^^^^^^^^^^^
pyo3_runtime.PanicException: called `Result::unwrap()` on an `Err` value: ComputeError(ErrString("values (of len 4096) must be a multiple of size (4100) in FixedSizeListArray."))

Issue description

Our code currently assumes that nested structures span a single data page. This is not necessarily true.

Expected behavior

Proper collecting.

Installed versions

Replace this line with the output of pl.show_versions(). Leave the backticks in place.