[Rocket League] Add missing stats in existing events

Related game: Rocket League

Related app name: Rocket League Tracker

Feature description:
The existing event already includes score and goals shown in the scoreboard:

image

We would like you to add assists, saves and shots to let us utilize them as part of the match history and match reports in the app.

https://overwolf.github.io/docs/api/overwolf-games-events-rocket-league#stats

Impact for my app: high.