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GH-40266: [Python] Mark ListView as a nested type (#40265)

### Rationale for this change

ListView types are nested, so `is_nested()` should return True.

### What changes are included in this PR?

* `pa.types.is_nested(pa.list_view(<type>))` returns True

### Are these changes tested?

Yes, unit tested.

### Are there any user-facing changes?

Yes.
* GitHub Issue: #40266

Authored-by: Dane Pitkin <dane@voltrondata.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>