Dispatch events around publishing

[smatyas]

Hi, I saw similar requests in #147 and #201 and I wanted this feature to collect more metrics in my application.

Would you consider merging a PR like this?

Of course, we can work more on the details like event names, places etc., I'd just like to know an early answer if it's a no-go.

[smatyas]

@videlalvaro is this something you would consider merging?

[mihaileu]

@theodormanolescu what do you think about this ?