fix(HTTP Server): can't set custom statusText

[coratgerl]

What does this PR do?

On node we can change the statusText in the Response. On Bun, Bun.serve and createServer from node:http only returns the default statusText define here https://github.com/oven-sh/bun/blob/main/src/bun.js/api/server.zig#L1039.

So actually the two following code doesn't change the statusText

Bun.serve({
  fetch(request) {
    return new Response(request.url, {
      statusText: "customStatusText",
    });
  },
  port: 0,
});

import { createServer } from 'node:http'

const server = createServer((req, res) => {
	res.writeHead(200, 'statusMessage')
	res.end('Hello World\n')
})

server.listen(3000)

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

I wrote automated tests