feat: Add array_max function support

[erenavsarogullari]

Which issue does this PR close?

Closes #14469.

What changes are included in this PR?

Currently, Spark, Snowflake and Presto support array_max function. This can also be useful for DataFusion.

array_max(make_array(3,1,4,2)) => 4
array_max(make_array('h','e','o','l','l',NULL)) => o
array_max(make_array(NULL,NULL)) => NULL

Spark: https://docs.databricks.com/en/sql/language-manual/functions/array_max.html
Snowflake: https://docs.snowflake.com/en/sql-reference/functions/array_max
Presto: https://prestodb.io/docs/current/functions/array.html#array_max-x-x

All potential use-cases have been covered like different data_types, empty array, NULL etc.

Are these changes tested?

Added new UT cases to verify array_max function in terms of different source arrays.

Are there any user-facing changes?

Yes, new SQL function is supported and documentation has also be updated.