Don't publicize Kernel core extensions

This is a reaction to a [bug] we hit in web-console. The cause of it was
a `Kernel` extension called `#console` that was public and was fighting
over Railties with console block to be run on `rails console`. We solved
it by making the method private. We did that through `module_function`
so `::Kernel.console` can be invoked even in `BasicObject`.

I'm proposing to make most of the core Active Support `Kernel`
extensions `module_function` as well. Those are currently public and we
are polluting every `Object` public interface with them.

```ruby
>> Object.new.respond_to? :silence_warnings
=> true

>> Object.new.respond_to? :with_warnings
=> true

>> Object.new.respond_to? :enable_warnings
=> true

>> Object.new.respond_to? :suppress
=> true
``

Some extensions like `Kernel#class_eval` should be public, but most of
them don't really need to be.

[bug]: https://github.com/rails/web-console/issues/184

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