cucumber-js: this in beforestep hooks is not world

@benjamine cucumber-js already keeps track of how long each step takes. That data is available in the json formatter and in the new usage formatters

@jbpros BeforeStep and StepResult events are useful. In my case I’m using them to log timings for each step (only when there’s a failure or in a verbose mode), which sometimes helps sometimes debugging, or find slow steps. I can see it also being useful to run certain checks after a step that has a tag, eg:

Scenario: Log In
Given I visit homepage
When I enter my credentials
@screenshot-compare
Then I'm logged in

Then you can use that tag to take a screenshot after that step and use it for screenshot comparison checks, just an example.

ps: my bad, tags cannot be applied to a specific step, https://github.com/cucumber/cucumber/wiki/Hooks#tagged-hooks