[C++] Add a "list_contains" kernel

Assume you have a list array:

arr = pa.array([["a", "b"], ["a", "c"], ["b", "c", "d"]])

And you want to know for each list if it contains a certain value (of the same type as the list's values). A "list_contains" function (or other name) would be useful for that:

pc.list_contains(arr, "a")
# -> True, True False

The current workaround that I found was flattening, checking equality, and then reducing again with groupby, but this is quite tedious:

>>> temp = pa.table({'index': pc.list_parent_indices(arr), 'contains_value': pc.equal(pc.list_flatten(arr), "a")})
>>> temp.group_by('index').aggregate([('contains_value', 'any')])['contains_value_any'].chunk(0)
<pyarrow.lib.BooleanArray object at 0x7ffaf3f8de20>
[
  true,
  true,
  false
]

But this also only works if there are no empty or missing list values.