Have a way to get the options that the handler for a simulated event set

I am adding functions in avh4/elm-program-test to help verify correct implementation of links in single-page apps. To do this correctly, I need a way to test whether the onClick handler of a found node is setting the `preventDefault` option.

This could possibly be done by changing `toResult` to:

```elm
toResult : Event msg -> Result String { msg : msg, options : Html.Events.Options }
```

Or maybe by adding:
```elm
getOptions : Event msg -> Result String Html.Events.Options
```

Start by examining the Event.toResult entry point and the proposed getOptions API in the issue. Determine how simulated event handlers currently expose their result, then verify that callers can inspect Html.Events.Options, including preventDefault, when testing a found node's onClick handler.

Written by the indexing model from the issue text.