Implement native function of map_from_arrays

[weimingdiit]

Describe
map_from_arrays(keys, values) is not supported in Auron’s native execution path, so queries using it fall back instead of being executed natively.

Describe the solution you'd like
Add native support for Spark map_from_arrays(keys, values) through the extension-function path.

The implementation should keep Spark semantics aligned:

• create a map from the given key/value arrays
• require all elements in keys to be non-null
• preserve Spark-compatible null propagation and type behavior
• add regression tests to verify semantic consistency with Spark