deprecating return_type in favor of return_type_from_args

[rluvaton]

Having return_type does not really reflect the UDF actual nullability.

the following problems exists when UDF wrongly report their nullability:

Disallow optimization based on the expressions nullability.

For example lets assume I have 2 columns:

1. col1 which is i64 without nulls
2. col2 which is i64 with nulls

and the expression ceil does not does not implement return_type_from_args, so by default the nullability is true

can't optimize the following query and

this means that I can can't optimize this query

select coalesce(ceil('col1'), 'col2') from tbl;

to be this:

select ceil('col1') from tbl;

because ceil says that the nullability is true even though the input expression is not nullable

the same can be for not able to remove the expression array_remove_all(array, null) if the array expression report that it is nullable while it is not

Wrong types

creating the wrong type:

> select arrow_typeof(make_array(1));
+------------------------------------------------------------------------------------------------------------------+
| arrow_typeof(make_array(Int64(1)))                                                                               |
+------------------------------------------------------------------------------------------------------------------+
| List(Field { name: "item", data_type: Int64, nullable: true, dict_id: 0, dict_is_ordered: false, metadata: {} }) |
+------------------------------------------------------------------------------------------------------------------+
1 row(s) fetched.
Elapsed 0.002 seconds.

should be nullable false but because make_array implement return_type it does not get that information

[rluvaton]

@alamb take:

We can start return_type deprecation after this PR

I recommend we do not deprecate return_type - after this PR I think we have a nice API. Namely most simple uses can use return_type and ones that need more control (like returning nullability, or getting scalar args) can use return_type_from_args

Originally posted by @alamb in #14094 (comment)

Which I disagree as I can no longer do the optimization and more