Support arbitrary objects

First of all: thank you so much for this project! It really contributes to making the whole Deno ecosystem more mature.

That being said, I'm missing something that the Node equivalent of this lib supports, namely printing arbitrary objects. I'm not sure how sophisticated the formatting algorithm should be, but I wish that I could just pass whatever I have to `debug` and get a nice excerpt, much like `console.log` does it.

Are there any plans to implement this? :)