Add ability to minify JSON

I oftentimes use https://json.pizza to edit JSON values that stored (minified) in a database. Currently, I can copy and paste my JSON into json.pizza, hit CMD+enter, and make my edits. However, I am missing a step in my workflow: making the beautified JSON minified again.

What are your feelings on having the ability to "un-format" the JSON as well @kritzware? I can provide a PR of course.

No files or tests are identified. Start by tracing the existing CMD+Enter beautify workflow in json.pizza and determine where a reverse action belongs; done means users can turn beautified JSON back into a compact form for copying or storage.

Written by the indexing model from the issue text.