Make best effort to detect remounts #169

Suggestion via slack:

One thing that also I’d love to know during debugging is if a certain compnent was remounted (aka now has new identity) or not. I’m trying to understand if by some reason my app does too many renders. Like maybe some sort of auto-incrementing id could work for me here. Maybe there’re better and more usable ways to do it, like showing unmounted components in the tree, but i dont know