Adds default Never action type

[mliberatore]

What it Does

For view stores that don’t have actions associated with them, this extension makes declaration and conformance much simpler. You basically just ignore the Action type and associated method all together.

How I Tested

1. Commented out this extension and declared:

final class MyViewStore: ViewStore {
    var viewState = ""
}

2. Got a compiler error that I didn't fully implement the ViewStore protocol.
3. Uncommented the extension.
4. Compiler error went away.

Notes

I believe it was @bcapps who originally authored this extension, so credit goes to him.

Screenshot

N/A