Parser Improvements & A Parser Fix

Changed

• ide: refactor to use AnyName node (#1250)

• parser: refactor ast::RelationFromItem to use ast::RelationNameRef (#1251)

• parser: add more nodes for ast on top of cst -> more enums (#1248)

• parser: refactor Name/NameRef to more specific nodes (#1246, #1247)

  This also fixes schema qualified sequence names:

  CREATE TABLE foo (
      id int GENERATED ALWAYS AS IDENTITY (SEQUENCE NAME public.myseq START 1)
  );