Support current spec of aggregate function calls

[apstndb]

Aggregate function calls have several optional clauses.
https://cloud.google.com/spanner/docs/reference/standard-sql/aggregate-function-calls

function_name(
  [ DISTINCT ]
  function_arguments
  [ { IGNORE | RESPECT } NULLS ]
  [ HAVING { MAX | MIN } having_expression ]
)

I think

• {IGNORE | RESPECT } NULLS
• HAVING {MAX | MIN}
  are missing in memefish.

$ go run ./tools/parse --mode statement 'SELECT ARRAY_AGG(x IGNORE NULLS)'        
2024/08/21 18:08:23 syntax error::1:20: expected token: ), but: IGNORE

  1:  SELECT ARRAY_AGG(x IGNORE NULLS)
                         ^~~~~~
exit status 1

$ go run ./tools/parse --mode statement 'SELECT ANY_VALUE(year HAVING MAX inches)'
2024/08/21 18:07:17 syntax error::1:23: expected token: ), but: HAVING

  1:  SELECT ANY_VALUE(year HAVING MAX inches)
                            ^~~~~~
exit status 1