[CM] Event Stream: Two events per action

[vadimkibana]

Shall we track two events for some actions: (1) before the actions starts; (2) after actions successfully completes of fails.

For example, instead of just tracking CRUD delete event, we would track deleteStart and deleteEnd events. deleteStart would fire every time somebody attempts the "delete" action, the deleteEnd event would contain information whether the action was completed and whether it was successful.

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Incremental progress:

• Start with just delete events, which are logged after successful completion.
• Maybe in the future add deleteBefore events.

[elasticmachine]

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