`useMatches` bindings

https://remix.run/docs/en/v1/api/remix#usematches

This is a little tricky as while a basic `match` can be modelled as:

```rescript
type match = {
  pathname: string,
  params: Js.Dict.t<string>,
}
```

It doesn't include `handle`, the property that is most important from the hook. I'm not sure how best to type this.