Use default cast for sliced list arrays if pyarrow >= 4

[albertvillanova]

From pyarrow version 4, it is supported to cast sliced lists.

This PR uses default pyarrow cast in Datasets to cast sliced list arrays if pyarrow version is >= 4.

In relation with PR #2461 and #2490.

cc: @lhoestq, @abhi1thakur, @SBrandeis

[SBrandeis]

I believe we don't use PyArrow >= 4.0.0 because of some segfault issues:

datasets/setup.py

Line 78 in 1206ffb

"pyarrow>=1.0.0,!=4.0.0",

Can you confirm @lhoestq ?

[albertvillanova]

@SBrandeis pyarrow version 4.0.1 has fixed that issue: #2489 😉

[lhoestq]

Nice thanks ! I didn't know it was supported now :)