Move Angular event handlers to methods

### Currently

As with other output, the Angular output passes in-line event handling code through. For example, this input:

```
(state.list = [...state.list, state.newItemName])}
>
```

Produces this output:

```

Add list item

```

This will not work in the general case (or in the specific case above), because Angular has its own notion of the syntax that works for an in-line event handler. Angular does not accept arbitrary TypeScript or JavaScript like a JSX/TSX-based framework.

### Expected

To make Angular output work for nontrivial event handlers, it will probably be necessary to output the event handling code into a method in the component, and call that method from the generated event handler, roughly like so:

```

Add list item

handleClick() {
this.list = [...this.list, this.newItemName]
}

```