Support onOpen and onClose

[dgoemans]

window._faslet global supports the following methods:

      onOpen?: (productId?: string) => unknown
      onClose?: (productId?: string) => unknown

and the react component should also have these configurable as props

[dgoemans]

cc @Fedwar
This has been resolve in this release
https://github.com/Faslet/widget_react_component/releases/tag/v0.4.0

[Fedwar]

@dgoemans , I am very grateful to you and appreciate your work and time! Thank you for your efforts and for finding the time for me.