Improve how to contribute and review expectations

[mariajgrimaldi]

Description

Some comments I've gathered from the community survey on the challenges/suggestions section:

The most confusing part for me was figuring out WHO should be reviewing requests? Or if there was a process for requesting a review. Otherwise, I found documentation to be very helpful. My biggest complaint, last time I was working in these repos the documentation was still in PRs and a WIP, but it contained a lot of useful and important info. Hopefully those PRs made their way into being merged at this point to help discoverability.

The events and filter definitions are in a separate repo and that always creates some friction with PRs since you have a multi-step process of merging and bumping versions based on another pr.