[Experimental] Add SwiftUI.Binding support

[k-kohey]

Motivation and Context

Most views that simply receive the state and reflect it in its appearance only need to get the state through a StateReader.
However, some views that update their state, such as a TextField, need to generate a SwiftUI.Binding.
I want to hide the generation process.

// current
TextField("hoge", text: .init(get: {
    return store.state.inputingText
}, set: { value in
    store.commit {
        $0.inputingText = value
    }
}))

// ideal
TextField("hoge", text: store.binding(\.inputingText))

Description

StoreType provides a function that returns the instance of SwiftUI.Binding.

[muukii]

Thank you for your contibutions.
Since the current Verge's SwiftUI support is not enough, your contributions and help would be a big support.

[muukii]

It would be better to add the same method in StoreComponentType which just calls directly StoreType's one.

[muukii]

or if you don't use StoreComponentType, we don't need to do this.

[k-kohey]

✅ 6a55ea3

[k-kohey]

Thank you for the review and the approval!