feat(react-server): custom react server entry

[hi-ogawa]

This allows extending react-server side server code, for example:

//
// src/entry-react-server.tsx
//
import {
  type ReactServerHandler,
  handler as baseHandler,
} from "@hiogawa/react-server/entry-react-server";

export const handler: ReactServerHandler = async (ctx) => {
  // handle trpc request https://trpc.io/docs/server/adapters/fetch
  const url = new URL(ctx.request.url);
  if (url.pathname.startsWith("/__trpc/")) {
    return new Response("...");
  }

  // run server action/component handler with custom async context
  // https://nodejs.org/api/async_context.html#class-asynclocalstorage
  return myAsyncContext.run({ ... }, () => baseHandler(ctx));
};

//
// vite.config.ts
//
export default defineConfig({
  plugins: [
    vitePluginReactServer({
      entry: "/src/entry-react-server.tsx",
    }),
  ],
  ...
});

TODO

• demo
• test