refactor(store): rewrite page event to support partial update

[Saul-Mirone]

Make it possible to:

page.updateBlock(model, () => {
  model.foo = 'foo';
  model.scope.bar = 'bar';
});

The whole event flow has been rewritten. Previously we use observeDeep to track prop changes in blocks. However, the problem of this flow is that when only part of a prop is changed, it's hard to track it in a top-down pattern.

Currently, we observe the changes in proxy to make it possible to notify changes when some part of the data has been updated.

[vercel]

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[doodlewind]

Requires summary of the API surface update in PR desc 🤔