feat: add setup function for spec

[Saul-Mirone]

const DocPageSpec: BlockSpec<DocPageBlockWidgetName, DocPageService> = {
  schema: PageBlockSchema,
  service: DocPageService,
  view: {
    /* ... */
  },
  setup: (slots, disposables) => {
    disposables.add(slots.mounted.on(onMounted));
    disposables.add(slots.viewConnected.on(onViewConnected));
    disposables.add(slots.widgetConnected.on(onWidgetConnected));
  }
}

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[doodlewind]

Guess the docs/guide/block-spec docs could also be updated.

And wondering for block-specific setup logic, what' the best practice to distinguish between using the service.mount and spec.setup?

[Saul-Mirone]

Guess the docs/guide/block-spec docs could also be updated.

And wondering for block-specific setup logic, what' the best practice to distinguish between using the service.mount and spec.setup?

1. I'll add the doc in next pr.
2. The setup can be configured when you try use a spec, the service.mount method is used to define a spec.

[doodlewind]

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