Use chartkick gem to improve the visualization of custom_form submissions.

Issue: https://projetos.colivre.coop.br/issues/5962

This MR add a new action called review. On the form index page, when click on the form submissions, noosfero will redirect to a page that will show a resume of the form submissions. This monitoring will be showed with several graphs. To questions of unique answer, a pizza graph. To questions with multiple answers, a column graph. To questions of text, a table with the user name and his answer. The main focus of this MR is on the backend to generate the graphs. A new MR will be made, with improvements on the UI of the review page.