Formatter does not add space after comma

[Pablo Rodriguez Mira]

Describe the bug

The formatter does not add a whitespace after comma if the user forgets it. I.e., the following query

select asdf, substr(asdf,1,2) as qwerty
from table1

gets formatted as

SELECT asdf, 
       substr(asdf,1,2) as qwerty
FROM table1

Expected:

SELECT asdf, 
       substr(asdf, 1, 2) as qwerty
FROM table1