Add spaces aroung list items

[vkatsuba]

Currently formatter add spaces in maps, tuples, records with config:

{format, [{ options, #{ spaces_around_fields => true } }]}.

will format empty data like

#{ a => b }

But this rule is not apply to lists. I would like it to be formatted lists like:
From

-export([init/1]).

To

-export([ init/1 ]).

I suppose it would be great to add additional rule like: spaces_around_items => true or similar.

Regards,
--V