[Backport 2.19-dev] Add unified function interface with function discovery API#5047

LantaoJin merged 1 commit into2.19-devopensearch-project/sql:2.19-devfrom

backport/backport-5039-to-2.19-devopensearch-project/sql:backport/backport-5039-to-2.19-devCopy head branch name to clipboard