[CM] Event Stream: Content Insights UI for Admins

[vadimkibana]

For the demo day:

• Show how events could look like in content item flyout
  • Timeline of events for that content item
  • Chart of aggregated view events by day

For the demo day, option 2:

• Export event stream to regular index, and create dashboard that shows some charts

For production, option 1:

• Create custom UI in Stack Management
  • Load data through CM RPC - so internal storage details are not exposed and Event Stream remains as system index.

For production, option 2:

• Create a custom dashboard.
  • Then need to work around Event Stream being a system index.
  • The dashboard will rely on internal implementation details of the Event Stream.

[elasticmachine]

Pinging @elastic/appex-sharedux (Team:SharedUX)