feat(server): support for server.sockWrite

[chenjiahan]

Summary

Added a sockWrite method to the RsbuildDevServer API, enabling middleware to send messages (e.g., 'static-changed') to the HMR client to trigger actions like page reloads.

This is consistent with the sockWrite function in the setupMiddlewares config, and now developers can call it through the JS API.

const rsbuildServer = await rsbuild.createDevServer();
if (someCondition) {
  rsbuildServer.sockWrite('static-changed');
}

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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