Rename functions-array to functions-nested to collect all nested-type functions

[goldmedal]

Is your feature request related to a problem or challenge?

Since many implementations of map UDF rely on make_array, we plan to create another crate to collect all the functions for nested types (e.g., array, struct, or map), as discussed in #11572 (comment) and #11546 (comment).

Describe the solution you'd like

Technologically, I plan to rename functions-array that includes the array and map functions currently to functions-nested, then move struct functions to functions-nested.
The array_expressions feature will also be renamed to nested-expressions.

Describe alternatives you've considered

No response

Additional context

No response

[goldmedal]

take

[goldmedal]

Let's move the struct functions to functions-nested by another PR.