Polars panics when trying to read ndjson from a file-like object

[jamesperez2005]

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

df = pl.DataFrame(
    {
        'x': [1, 2, 3],
        'y': ['a', 'b', 'c'],
    }
)
df.write_ndjson("/tmp/testme.ndjson")
pl.read_ndjson(open("/tmp/testme.ndjson"))

Log output

No response

Issue description

It is very useful to be able to read ndjson from file objects, e.g. when reading compressed data

Expected behavior

The dataframe should be successfully read

Installed versions

--------Version info---------
Polars:               0.20.2
Index type:           UInt32
Platform:             macOS-14.2.1-arm64-arm-64bit
Python:               3.8.13 (default, Jun 26 2022, 15:51:52) 
[Clang 13.1.6 (clang-1316.0.21.2.5)]

----Optional dependencies----
adbc_driver_manager:  <not installed>
cloudpickle:          <not installed>
connectorx:           <not installed>
deltalake:            <not installed>
fsspec:               2022.10.0
gevent:               <not installed>
matplotlib:           3.6.1
numpy:                1.23.4
openpyxl:             3.1.2
pandas:               1.5.1
pyarrow:              9.0.0
pydantic:             <not installed>
pyiceberg:            <not installed>
pyxlsb:               <not installed>
sqlalchemy:           1.4.42
xlsx2csv:             <not installed>
xlsxwriter:           <not installed>

[jamesperez2005]

Same reproduces with read_json/write_json, BTW