arrow

ARROW-11952: [Rust] Make ArrayData --> GenericListArray fallable instead of `panic!`

# Background:
Left over cleanups suggested by from @sunchao on  https://github.com/apache/arrow/pull/9425

Broken out from https://github.com/apache/arrow/pull/9508

# Rationale:

Don't use panic! directly. However,  since the caller of this function still calls `unwrap()`, I am not sure how much of an improvement this change really is. However it may set us up for a more `safe` future eventually

Closes #9691 from alamb/alamb/fallable_list_conversion

Authored-by: Andrew Lamb <andrew@nerdnetworks.org>
Signed-off-by: Andrew Lamb <andrew@nerdnetworks.org>