feat(google-maps): Add support for polygonPathsChange event

### Feature Description

Hi, old [AGM - Angular Google Maps](https://github.com/sebholstein/angular-google-maps) has polygon paths change event and it is so useful. Now I'm converting my components from AGM to google-maps component but it does not support polygon paths change event. It would be great if this component support polygon paths change event like old agm component.

https://github.com/sebholstein/angular-google-maps/blob/340e3e35b60169b901842d0ca71c13944ad7fd2c/packages/core/src/lib/directives/polygon.ts#L197

My old implementation
```html

```

New implementation with google-map
```html

```

### Use Case

In my use case I control intersection and cover functionality with old component `polyPathsChange` event, now I can't control them with efficient way so it is super powerful and helpful feature to be when google-map support `polygonPathsChange` event itself as old component support.

map-polygon コンポーネントから始め、利用可能なポリゴンイベントを packages/core/src/lib/directives/polygon.ts#L197 で参照されている AGM ポリゴン実装と比較します。編集可能なポリゴンのパスの変更がどのように公開されるかを追跡し、そのうえで、新しい polygonPathsChange イベントが移行例に対して期待どおりに変更を報告することを確認します。

索引モデルが issue の本文から書いたものです。