Reducing whitespace in group_by

[ltchikindas]

reducing whitespace in compiled SQL for legibility

select
foo.a
, foo.b
, foo.c
, sum(foo.d)
from
foo
{{group_by(n=3)}}

now results in

select
foo.a
, foo.b
, foo.c
, sum(foo.d)
from
foo
group by
1,2,3

[drewbanin]

Thanks @ltchikindas! This one was a long time coming :)

Just kicked off a build here - one minor nit commented inline, then this will be good to merge when the tests pass :)

[clrcrl]

🚀