Added Switch component

[forman]

@b-yogesh This PR serves as a template for other new components.

Addresses #41

[b-yogesh]

Let's add new/modify existing demo to show how these new components are used. Would be easier for the user
Decided not to go with this as a UI reference will be added later.

[forman]

Let's add new/modify existing demo to show how these new components are used. Would be easier for the user

I actually don't want this now, because it complicates the demo code. Instead I want to add a UI reference later.
E.g. adding a storybook: https://storybook.js.org/
I don't know yet if this is applicable at all. If not, we should create a dedicated demo app that shows all the components that we have. It would also allow for switching plugins! But not now and only if Chartlets becomes a "success" story!