[Replay Details - Breadcrumbs] Introduce new category `ui.lifecycle` for mobile

[romtsn]

This is rather a discussion point.

If we're sending all lifecycle events with the navigation category, it looks something like this (which is not pretty):

There are multiple potential solutions to this:

• Only have one breadcrumb per screen (i.e. no lifecycle events, just one navigation breadcrumb when a screen is interactable/visible, meaning Activity.onResume or ViewController.viewDidAppear)
• OR introduce new category ui.lifecycle which will have lifecycle crumbs in addition to navigation crumbs. Perhaps we could make them collapsible under a parent navigation breadcrumb for a screen
• OR keep it as-is, as shown on the screenshot above

I'm personally leaning towards the first option here, meaning there's no work on the frontend side and we can just backlog it, and re-iterate after customers' feedback. The SDKs will do the filtering, and only send one navigation breadcrumb per screen navigation event.

[michellewzhang]

thoughts:

• we could have only one nav breadcrumb per screen (good enough for GA)
• potentially another lifecycle category based on user feedback, we like this idea: "Perhaps we could make them collapsible under a parent navigation breadcrumb for a screen"