refactor(appbar): add position prop

[WesSouza]

This allows users to have the AppBar stacked in their app view, as they can in react95-native.

Note: this commit includes changes from #332, given that was opened in a fork. It should be rebased once that is merged.

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Name	Status	Preview	Updated
react95	✅ Ready (Inspect)	Visit Preview	Aug 5, 2022 at 2:29PM (UTC)

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:tada: This PR is included in version 4.0.0-beta.13 :tada:

The release is available on:

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• GitHub release

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[github-actions[bot]]

:tada: This PR is included in version 4.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: