(feat/perf) Allow vite-plugin-vue-devtools to load only on inspection/fine control features

[hugoattal]

Here's my usecase: I have a rather big and complex project with a ton of components.

It works flawlessly until I open the DevTools browser extension. From this, it becomes a rather slow, but that's expected. I can debug what's wrong and reload the page when I'm done to go back to a performant state.

The problem is that the Firefox extension is not updated anymore (still in 7.7.7) and I find the Vite plugin really cool. My problem is when I use it, it directly loads in the browser, so my project is in the slow state from the start.

My suggestions:

• Make the plugin load after a shortcut, or when we click on the little "V", so that by default it's not injected and the app is performant. For now, I have to comment the vueDevTools() line on my vite.config.ts file to disable it, and have to reload with the line commented out when I want to debug.
• Make it possible to disable some feature. I suspect things like the timeline can make it slow. 99% of the time, I only use the component inspection, so if I could only enable this feature, this could be easier to work with.