Add Stimulus debug option via url param

[eelcoj]

This would be the first step into branching this library in more than just custom action options.

Set up:

// app/javascript/controllers/application.js

import { Application } from "@hotwired/stimulus"
import { registerDevMode } from "stimulus-fx";

const application = Application.start()
registerDevMode(application)

window.Stimulus = application

export { application }

You can then append ?debug=true to see all debugging logs in the console for Stimulus (similar to adding application.debug = true). Append ?debug=false to disable again.