Script events when replaying the chain without validation

When replaying the chain without validation, scripts do not get evaluated and therefore script events are not emitted.

It would be helpful, however, for folks to have the ability to turn on all events regardless of the validation flag. See #3052

Start by reading the related issue #3052 and tracing the chain-replay path used when validation is disabled. Clarify how script evaluation and event emission should be controlled, then define what enabling all events regardless of validation should mean and how completion would be verified.

Written by the indexing model from the issue text.