Provide a way to detect that document is created or updated via CSV import in automation

Use case: Using CSV import to create related documents.

You of course can't use the document uuid to represent the relationship. You might instead use a path. But you must then use an event handler (i.e. "About to create", "Before document modification") to convert the path to a document ID.

Currently the event handler runs for all documents, so there is some risk in increased complexity in maintaining the code, watching for side-effects, etc. It would be useful to have a way to filter the event handler to only run for documents created/updated via CSV.

There is a discussion on Slack about this that I will link.