Create a rake task for checking and formatting with Syntax Tree

[kddnewton]

For inspiration, check out: https://github.com/prettier/plugin-ruby/blob/main/lib/prettier/rake/task.rb.

[wenderjean]

@kddnewton Would you mind assign this one to me? I'd like to give it a try and have my feet wet in syntax_tree :)

[kddnewton]

Done! Let me know if you get stuck.

[wenderjean]

@kddnewton I created a draft PR to validate the approach I decided to use, when you have some time let me know if I'm in the right way. :)