feat: add storybook

[olizilla]

Add storybook scaffolding so we can iterate on our components and all the states they can be in.

Uses the beta release of storybook v7 as it has support for pnpm.

Part of #225 - we need this to demonstrate out components in all their possible states so we can make them good.

License: MIT
Signed-off-by: Oli Evans oli@protocol.ai

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Sandbox	Source
@w3ui/example-react-file-upload	Configuration
@w3ui/example-react-sign-up-in	Configuration
@w3ui/example-react-uploads-list	Configuration
@w3ui/example-solid-file-upload	Configuration
@w3ui/example-solid-sign-up-in	Configuration
@w3ui/example-solid-uploads-list	Configuration
@w3ui/example-vue-file-upload	Configuration
@w3ui/example-vue-sign-up-in	Configuration
@w3ui/example-vue-uploads-list	Configuration

[olizilla]

Using context for all the properties of our components makes it harder to set them up in storybook. We might want to export basic UI components so we can just pass in state as props and make it easier the styling part easier to iterate on.

storybook expects us to statically configure Args that would be passed in as props to our components, but we have to use the escape hatch of the render fn, as demo'd in this PR to configure a context instead of passing in props.