Provide a way to track identical controller state updates

[mcmire]

In some cases, controllers attempt to update the state but no change is actually made to state. This causes unnecessary re-renders in clients, which can cause performance issues, especially on mobile.

We need a way to track this so that we more information on how to address this issue.

[mcmire]

Here is a draft PR which adds an EventAnalyzer class to controller-utils: #5823. We should take a closer look at this.