fix: add wrapperStyle to Snackbar

[jaulz]

Motivation

The PR adds a new property to the Snackbar in order to overwrite these styles:

react-native-paper/src/components/Snackbar.tsx

Lines 289 to 293 in 5425413

	wrapper: {
	position: 'absolute',
	bottom: 0,
	width: '100%',
	},

Test plan

n/a

[callstack-bot]

Hey @jaulz, thank you for your pull request 🤗. The documentation from this branch can be viewed here.

[github-actions]

The mobile version of example app from this branch is ready! You can see it here

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[Trancever]

@jaulz What's your use case?

[jaulz]

@Trancever I need to calculate the height of the Snackbar and thus it needs to be positioned relatively.

[Trancever]

@jaulz Can't you just pass onLayout? It's passed to the underlying Surface component so It should return the correct dimensions and position.

[jaulz]

@Trancever unfortunately not as I use a custom container that calculates the layout and triggers some other effects so I think this is the only possibility for me...