refactor(store): support streaming editor.doc from empty state

[doodlewind]

This continues from #6167 and removes the requirement for ensuring non-empty doc to be attached to editor.

Before:

const editor = new AffineEditorContainer();
// ...load the doc in either sync or async way

// after the doc is loaded
editor.doc = doc;

After:

const editor = new AffineEditorContainer();
const doc = collection.createDoc();
editor.doc = doc;

// load or create the doc, content will be streamed
// after doc loaded from provider, call this line to render it
indexeddbProvider.on('sync', () => {
  doc.load();
})

The slots.ready is now not required to be used in official docs.

A new example shows the basic case using BlockSuite with default yjs providers:

Screen.Recording.2024-03-20.at.5.22.53.PM.mov

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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