feat: Support IGNORE NULLS only for allowed builtin window functions

Currently parser allows to parse queries which IMHO should be failing by unsupported syntax.
Like
SELECT COUNT(*) IGNORE NULLS OVER() FROM (values (1), (null), (2));

The allowed list for IGNORE NULLS can be found https://github.com/ronsavage/SQL/blob/master/sql-2016.ebnf

Start by tracing how the parser handles the IGNORE NULLS syntax, then compare its accepted functions with the allowed list in the linked SQL-2016 grammar. The change is done when unsupported forms such as COUNT(*) IGNORE NULLS are rejected while allowed builtin window functions continue to parse.

Written by the indexing model from the issue text.