Multiple menus with push animation

Is this possible?

I mean I can wrap two `burger-menu`s. But is this a good idea? And is there a nicer solution?

```
{{#burger-menu
animation='push'
position='left'
as |burger1|
}}
{{#burger1.menu itemTagName="li" dismissOnItemClick=true as |menu|}}
Left
{{/burger1.menu}}

{{#burger1.outlet}}
{{#burger-menu
animation='push'
position='right'
as |burger2|
}}
{{#burger2.menu itemTagName="li" dismissOnItemClick=true as |menu|}}
Right
{{/burger2.menu}}

{{#burger2.outlet}}

OPEN Left


OPEN Right

{{/burger2.outlet}}
{{/burger-menu}}
{{/burger1.outlet}}
{{/burger-menu}}
```

The issue only provides a nested `burger-menu` template example using the `push` animation on left and right menus. Start by reproducing that example and checking whether multiple push menus are supported or need a new API. Done would require a clear maintainer-approved behavior or documentation target, which is not present in the issue.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.