Replace document functionality

[theodorDiaconu]

https://docs.mongodb.com/manual/reference/method/db.collection.update/#replace-a-document-entirely

// fully override the doc
Collection.update(id, { a: 10, b: 5 })

[theodorDiaconu]

The replacement should be detected when we perform the update.
We create a new event type:
Event.IS_REPLACEMENT = 'ir'

We only send this event, alongside an update when this is detected.

Create a new method in ObservableCollection, replace(docId, newDocument), this will be similar to update() so we need to re-use some stuff from there.