[Popover] Add action property

[gregnb]

Here's an implementation of how I could see access to the getPositioningStyle method. It's simply a reference callback which will allow access to outside components to trigger updates. It is useful for content that could come in delayed and you need to reposition the Popover manually

Closes #9584

[gregnb]

Still need to add the unit tests but wondering if this is agreeable ?

[oliviertassinari]

The callback property sounds like the way to go. It's the same pattern than with refs.
I have been doing something similar on react-swipeable-views to solve the same use case. The only difference is that we use a generic name: action

Name	Type	Default	Platform	Description
action	function(hooks)		browser	This is callback property. It's called by the component on mount. This is useful when you want to trigger an action programmatically. It currently only supports updateHeight() action.

It's also something that we might need to solve Tabs ink repositioning issue. What about using the same property name and nesting the hooks into an object?

[oliviertassinari]

This block looks exactly like the one we have to handle the resize event.
Can we factorize the code?

[oliviertassinari]

Still need to add the unit tests but wondering if this is agreeable?

@gregnb Yes, it's close to being mergable :).

[gregnb]

@oliviertassinari took those suggestions and applied them! They are good ideas

[oliviertassinari]

@gregnb Good work 👍