Add focusScopeNode hook

[iamsahilsonawane]

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Is your feature request related to a problem? Please describe. Currently working on some desktop and TV application with lot of focus controls to play. I use useFocusNode and totally love it, but lack the hook for focus scope node for the FocusScopeWidget really gets into the way creating one hook separately for the internal semi widely used widget's focus node.

Describe the solution you'd like Would like to have it in the package itself. Creating a new useFocusScopeNode hook.

Describe alternatives you've considered I am using a separate hook file in the projects for this.

Additional context I'll be having a pull request for this coming. Would love to contribute!