[VL] Strip default comparator from array_sort for Velox offloading

### Backend

VL (Velox)

### Bug description

When Spark's array_sort is called without an explicit comparator (the default ascending sort), Spark internally
generates a LambdaFunction that wraps the simple ascending comparison in null-handling If/IsNull logic. Velox's
rewriteArraySortCall uses a SimpleComparisonMatcher that cannot parse this null-handling wrapper, causing the
expression to fall back to Vanilla Spark.

### Gluten version

main branch

### Spark version

spark-4.0.x

### Spark configurations

_No response_

### System information

_No response_

### Relevant logs

```bash

```

Start at rewriteArraySortCall and inspect how SimpleComparisonMatcher handles the LambdaFunction generated for array_sort without an explicit comparator. Reproduce the default ascending sort on Spark 4.0.x, then verify that the expression is offloaded to Velox instead of falling back to Vanilla Spark.

Written by the indexing model from the issue text.