Consider using ragged arrays to handle cls data

[paddyroddy]

Is Your Feature Request Related to a Problem? Please Describe

https://github.com/scikit-hep/ragged is designed to handle ragged arrays in an Array API compliant manner, i.e.

>>> import ragged
>>> a = ragged.array([[[1.1, 2.2, 3.3], []], [[4.4]], [], [[5.5, 6.6, 7.7, 8.8], [9.9]]])
>>> a
ragged.array([
    [[1.1, 2.2, 3.3], []],
    [[4.4]],
    [],
    [[5.5, 6.6, 7.7, 8.8], [9.9]]
])

Describe the Solution You'd Like

No response

Describe Alternatives You've Considered

No response

Additional Context

No response