feature: Add base interface

[FinHorsley]

Describe the solution you'd like

Add an interface that event classes can inherit from.

// A better name may be something like IRx or IReactive?
public interface IEvent<T>
{
    T Data { get; }
}

the implementation could then look like the following

public class RxUIControlEvents : IEvent<UIControl>
{
       public UIControl Data => _data;

       private readonly global::UIKit.UIControl _data;
       /// <summary>
       /// Initializes a new instance of the <see cref = "global::UIKit.UIControl"/> class.
       /// </summary>
       /// <param name = "data">The class that is being wrapped.</param>
       public RxUIControlEvents(global::UIKit.UIControl data)
       {
           _data = data;
       }

       // Event bindings removed for brevity
}

Why would this be useful?
This would then make it easy to create static helper methods for updating UI elements based on observables

public static Action<bool> Enabled(this IEvent<UIControl> reactive)
{
     return (enabled) =>
     {
           reactive.Data.Enabled = enabled;
     };
}

from the view code (e.g. UIViewController in iOS) this would enable

button = new UIButton();

ViewModel.Command
    .CanExecute
    .Subscribe(button.Events().Enabled())
    .DisposeWith(disp);

Additional Considerations

1. I'm coming from an iOS/Android perspective, so understand that the interface might not apply to all situations; pharmacist is about creating observables from events, so the IEvents idea might be a level on top of pharmacist?

2. RxSwift uses Rx where Pharmacist uses Events by default; adding the base interface would mean that Pharmacist wouldn't just be for events

Using the example above

ViewModel.Command
    .CanExecute
    // Confusing as this isn't an event
    .Subscribe(button.Events().Enabled())
    .DisposeWith(disp);

the Rx naming now makes more sense?

ViewModel.Command
    .CanExecute
    // More like the RxSwift style
    .Subscribe(button.Rx().Enabled())
    .DisposeWith(disp);

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