This makes it a bit more approachable to implement.
This required converting the state of Component to AnyElement, which
costs an allocation. I'm hoping this will be ok performance-wise now
that AnyElements use bump allocation, but I need to benchmark still.
This PR extracts the `Story` component into a separate `story` crate so
that it can be shared among various crates that define stories.
Release Notes:
- N/A
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Co-authored-by: Nate Butler <iamnbutler@gmail.com>
