make alignFormatter configurable

[syavorsky]

as per conversation in #93:

• export alignFormatter and make it configurable
• add the indent:number option

[syavorsky]

@brettz9 @renatho I ended up splitting the transformation logic from stringifying. So at the end stringifier is just concatenating tokens together, but before that you can process them as you like. Check out this example. I hope, tweaking the formatting should be easy enough with custom hooks, see what align and indent do

[brettz9]

Thanks for the heads up, and happy to see these transforms available. Hopefully the approach won't add too much to execution time. I'm unfortunately not in a position to try them out myself these days, though hopefully I can by the time you feel it is ready for a release. Thanks much!

[syavorsky]

@brettz9 no probs, tweaking transforms as needed later should not be a problem

[renatho]

Thank you @syavorsky!
Nice approach about the transforms 👏 I think it'll be easy to implement and it'll also create new possibilities for the lib! \o/

[syavorsky]

@renatho no prob, I should thank you indeed for kicking off the whole 1.0 refactoring :)