This reduces the surface area of our `Kernel` monkeypatch and removes
the need to `include Kernel` in a bunch of modules.
While we're here, also move `Kernel#require?` to `Homebrew` and fully
scope the calls to it.
Import these from the homebrew/aliases tap and deprecate that tap.
This required a little messing around with class/module/constant names
to get `brew tests` and `brew typecheck` to play nicely.
I added also added Sorbet type signatures and integration tests.
