Adding orHas and orHasNot query functions

[rickgoemans]

Is your feature request related to a problem? Please describe...

In our project we have a use case of needed a orHasNot.
Our goal is to retrieve all work orders which are not planned (planned_start is null) OR don't have a users assigned to it so that we can show in a planning tool which work orders require an action (planning and/or assigning a user.

Describe the solution you'd like

WorkOrder
    .query()
    .with(...) // Left out for demo purposes
    .where((workOrder, query) => {
        query.where('planned_start', null)
            .orHasNot('users')
    })
    .orderBy(...) // Left out for demo purposes
    .get()

Describe alternatives you've considered

The alternative that we are forced to use now is (my opinion) ugly code and can be seen below:

WorkOrder
    .query()
    .with(...) // Left out for demo purposes
    .where((workOrder, query) => {
        if (!workOrder.planned_start) {
            query.where('planned_start', null)
        } else {
            query.hasNot('users')
        }
    })
    .orderBy(...) // Left out for demo purposes
    .get()

Additional context

I'm looking for something like ->orHas(...) and/or ->orDoesntHave(...) in Laravel. Though considering Vuex's naming with relations I expect them to be called .orHas(...) and .orHasNot('...').

It would also be highly appreciated if these function can accept a callback as 2nd argument just like has does to further determine which relationships should match.