Add missing tab completion for VACUUM and ANALYZE with ONLY option

Hi,
Recently the ONLY option is introduced [1] for VACUUM and ANALYZE
commands. Attach provides improved tab completion for this new option
for both commands.

Along with this also added starting parenthesis "(" auto-complete as
multiple existing commands provide it and it makes it easier to
separate command options (VERBOSE, FREEZE, ... ) from table list.

[1] https://www.postgresql.org/message-id/flat/CADofcAWATx_haD%3DQkSxHbnTsAe6%2Be0Aw8Eh4H8cXyogGvn_kOg%40mail.gmail.com

Regards
-- 
Umar Hayat
Bitnine (https://bitnine.net/)