Make screenshot feature optional

[JamesOhJins]

I've been using your plugin and it works great!
However, it takes a little too much time since it takes screenshot after every actions (test duration doubled)
Also, I think it's unnecessary to store all the screenshots since we have option to screen record entire session.
Can you add it as a config so that we can choose whether to take screenshot or not to take screenshot after each step?

Thank you :)