feat: add support for 'array' datatype

[universalmind303]

example usage

const s = pl.Series(
  "a",
  [
    [1, 2],
    [3, 4],
  ],
  pl.FixedSizeList(pl.Int32, 2),
);

shape: (2,)
Series: 'a' [array[i32, 2]]
[
	[1, 2]
	[3, 4]
]

[Bidek56]

@universalmind303 Do we need to add any tests or docs for this feature? thx