Significantly improve FakeNavigator + small API updates around it and Navigator #1196
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See the CHANGELOG.md files for highlights, but in short: this PR significantly improves the
FakeNavigator
API and streamlines ourSaveableBackStack
init to no longer allow empty stacks.FakeNavigator
now just uses a real back stack under the hood, making it behave more realistically and more or less just act as a recording layer over it. It also supports custom back stacks.