[5.8] Add method to Guard contract

[TBlindaruk]

[5.8] Add method to Guard contract

• Added methods to the guard contract, since this method present in all Laravel Guards, but we could not use this if we will use the contact.

It is pretty the same PR as #25616

[taylorotwell]

Can you describe the benefit here? Is it for auto-completion purposes?

[TBlindaruk]

@taylorotwell ,

It is not only for type hinting.

I`m as a developer do not want to use the concrete class when I have used the DI, instead of that I have used the interfaces.

When I have used the interface, then I could not use the method which presents in the concrete class, but not present on the interface, since if concrete class will be changed, then I could not guarantee, then new class have this method

[taylorotwell]

They aren't really implementable at the contract level. At least authenticate isn't because the exception type it needs to throw is in the concrete illuminate/auth namespace.

Going to hold off for now as both of these methods are "convenience" helpers can you can achieve similar behavior without forcing all implementors to add them.