feat: enable multiple files in the same yjs doc

[zjkmxy]

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Summary

In current plugin-collab, the path to the XML fragment in the Yjs doc is hard-coded to 'prosemirror', which makes it impossible to put multiple Milkdown documents in the same Yjs document.
Since y-prosemirror has deprecated yDocToProsemirror for yXmlFragmentToProseMirrorRootNode, I move from Y.Doc & hard-coded path to user-provided Y.XmlFragment.

How did you test this change?

Tested with storybook page.

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Latest commit: bcea21f

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Name	Status	Preview	Comments	Updated (UTC)
milkdown-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 10, 2024 7:27pm