Save is incredibly slow on myxwiki.org sometime

Not sure how to reproduce locally but it's probably some listener doing something that takes a very long time when a document is saved.

Since I did not noticed this before it feels like a new listener in XWiki 8.0 or some new custom listener in a wiki.

We need to add calls to the step API in DefaultObservationManager so that we can get a report on how long each listener took when sending an event.