Update type for `findOneAndUpdate` options

Currently we use the mongodb type for  `FindOneAndUpdateOptions` options for `findOneAndUpdate` (https://github.com/plexinc/papr/blob/main/src/model.ts#L818)

However, a developer looking up the docs for these options will see `returnDocument` defaults to "before", while it defaults to "after" in papr