selenium-grid-scaler: Add abilty to scale more then the request coming to grid by Percentage

[Tal-E]

Hi team, it would be great if the selenium-grid-scaler had the option to scale not only when there is more request than browsers,
but also to leave some more browsers up than needed.
for example, if there are 20 requests for the browser instead of scaling to 20 It will be great to have the ability to scale 20% more than the requested, in this case, 24.
that way I can leave some space between the number of requests and the number of available browsers and be able to take more requests before needing to wait for a pod to come up (which takes some time)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[Tal-E]

Please don't close this, I do hope you will do this at some time