sql: check for CALL with OUT params in SQL routine is too eager

[DrewKimball]

A SQL routine cannot call a stored procedure that has OUT-params. However, it's ok for a SQL routine to call a PL/pgSQL routine that calls a procedure with OUT-params:

CREATE OR REPLACE PROCEDURE p_nested(OUT x INT) LANGUAGE SQL AS $$
  SELECT 1;
$$;
CREATE OR REPLACE PROCEDURE p_plpgsql() LANGUAGE PLpgSQL AS $$
  DECLARE
    a INT;
  BEGIN
    CALL p_nested(a);
    RAISE NOTICE 'a: %', a;
  END
$$;
CREATE OR REPLACE PROCEDURE p() LANGUAGE SQL AS $$
  CALL p_plpgsql();
$$;
CALL p();

Currently, CRDB fails with calling procedures with output arguments is not supported in SQL functions, while postgres succeeds.

Jira issue: CRDB-37784