[7.x] Add withoutEagerLoads function

[ahmedsayedabdelsalam]

I have some models which use the $with property to automatically load related media

In one situation I have to store only the object without the eager loads I found that I can use the method without(['media'])
but what if in the future I added some loaded relations to so I have to update the without(['media', 'anotherRelation]) too

I found laravel has a method called setEagerLoads($arr) and I can pass an empty array [] to clear all loaded relations
but I think if the method name is similar to without method name would be easy to remember and more descriptive.

[netpok]

In my opinion one should use the $with when the related models should be always loaded, for every other instance there are the scopes.

Also withoutEagerloads() is longer than setEagerLoads([]) and would promote the bad habit of using $with when not necessary so 👎 from me.

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

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