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Add getSnapshotBeforeUpdate lifecycle hook (#1112)

* Add getSnapshotBeforeUpdate lifecycle hook

* Fix copy paste error

* squash! more work on tests

* Fix wrong ref usage in test

* Fix test and add note about differences to react

* fixup! Fix tests

* squash! Workaround for wrong state reference

* squash! Fix state mutation

* Only clone previousState when necessary

* squash! Move lifecycle test around where it makes more sense

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