[8.x] Add morph type to attributes when making new pivot

[jasonlewis]

Currently when attaching a morph pivot the type will be set on the new pivot record as it's done within the overloaded baseAttachRecord method.

When making a new pivot it's handy to set the morph type as the pivot is ambiguous without it. My main use case is a deleting event on my custom morph pivot model. This event at the moment will only get the IDs for the pivot but not the morph type, so I don't exactly know what is being deleted.

If there's potentially problems elsewhere with setting this here then that's fine, it can be worked around for my cases, I just figured it'd be nice to get this in upstream.

Cheers.

[driesvints]

@jasonlewis Jason! 👋 It's been forever :D

[taylorotwell]

Hey Jason ❤️

So - I added a getMorphType method on the MorphPivot class for you. That should let you get to it without us having to worry about this potentially being a breaking change.

[jasonlewis]

Thanks fellas, hope to see you around! 😄