fix: array_sort doesnt respect array inputs for sort order/nulls first

[JSOD11]

Which issue does this PR close?

• Closes array_sort doesnt respect array inputs for sort order/nulls first #24132

Rationale for this change

array_sort now evaluates its optional order and nulls_order arguments per row instead of reading only the first row of each option column.

Previously, queries like this would use the first row's option value for the whole batch:

array_sort(arr, order)

So if row 1 used 'asc' and row 2 used 'desc', row 2 could still be sorted ascending.

This PR keeps the existing primitive and non-primitive sorting paths, but threads the option arrays through the sort logic so each output row uses that row's own options.

What changes are included in this PR?

Sort order can vary per row

query ?
select array_sort(arr, order)
from values
    (make_array(5, 2, 3), 'asc'),
    (make_array(5, 2, 3), 'desc'),
    (make_array(10, 20, 30), 'desc') as t(arr, order);

Before this PR, all rows used the first row's 'asc' option:

[2, 3, 5]
[2, 3, 5]
[10, 20, 30]

Now each row uses its own option:

[2, 3, 5]
[5, 3, 2]
[30, 20, 10]

NULL option values are handled per row

query ?
select array_sort(arr, sort_order)
from values
    (make_array(2, 1), 'ASC'),
    (make_array(2, 1), NULL),
    (make_array(2, 1), 'DESC') as t(arr, sort_order);

Before this PR, the NULL and 'DESC' rows still used the first row's 'ASC' option:

[1, 2]
[1, 2]
[1, 2]

Now the NULL option only affects its own row:

[1, 2]
NULL
[2, 1]

Null placement can vary per row

query ?
select array_sort(arr, order, null_order)
from values
    (make_array(5, 2, NULL, 3, NULL), 'asc', 'NULLS FIRST'),
    (make_array(NULL, 5, NULL, 3, null), 'desc', 'NULLS LAST'),
    (make_array(10, NULL, null, 20, 30, NULL), 'desc', 'NULLS LAST') as t(arr, order, null_order);

Before this PR, later rows could incorrectly reuse the first row's sort options.

Now each row gets the correct ordering:

[NULL, NULL, 2, 3, 5]
[5, 3, NULL, NULL, NULL]
[30, 20, 10, NULL, NULL, NULL]

Additional coverage

This also covers:

• primitive arrays without element nulls
• primitive arrays with element nulls
• non-primitive arrays, such as strings
• NULL order arguments
• NULL nulls_order arguments
• preserving valid empty lists as []

Are these changes tested?

cargo test -p datafusion-sqllogictest --test sqllogictests -- array_sort

Are there any user-facing changes?

Just the bug fixes described.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.23404% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.68%. Comparing base (bd86190) to head (c9881ce).

Files with missing lines	Patch %	Lines
datafusion/functions-nested/src/sort.rs	87.23%	8 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24502      +/-   ##
==========================================
- Coverage   82.69%   82.68%   -0.01%     
==========================================
  Files        1147     1147              
  Lines      447204   447300      +96     
  Branches   447204   447300      +96     
==========================================
+ Hits       369793   369865      +72     
- Misses      55002    55014      +12     
- Partials    22409    22421      +12     

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[JSOD11]

cc @Jefffrey for review when you get a moment