add anchor support to web

[chrisdrackett]

web is closer to an iPad than iOS or android. Ideally it would support "pinning" the action sheet to an element in the same way.

[bradbyte]

Sorry for the delay :facepalm:. This is essentially Android/Web (non iOS). We would need the ability to position the view based on the anchor node.

[bradbyte]

We're essentially rendering the sheet over the entire view centered.. https://github.com/expo/react-native-action-sheet/blob/master/src/ActionSheet/index.tsx#L296. This would need to change to coordinates of the element position.