PF4 Switch Component

[LHinson]

Add PF4 Switch Component: https://pf-next.com/components/Switch/examples/
In addition to a React review, this issue should be reviewed by the core contributors of this demo:
visuals: @maryshak1996

[guillaumevincent]

We need to discuss about the API for the switch component.
In my first draft (#761) I used the following props oneLabel, noLabel, labelOff, labelOn.

Can someone tell me if it's good?

[guillaumevincent]

After a discussion on slack, here the new api:

<Switch labelLeft="Data Sync" labelRight={<CheckCircleIcon />} />
<Switch labelLeft="Off" labelRight="On" />
<Switch labelRight={checked ? "On" : "Off"} />
<Switch labelLeft={checked ? "On" : "Off"} />

Thanks @dmiller9911