feat: custom response in hono/streaming

[Kanahiro]

related: https://github.com/orgs/honojs/discussions/2617

proposed signature

added new argument

// typeof stream()
(
  c: Context,
  cb: (stream: StreamingApi) => Promise<void>,
  onError?: (e: Error, stream: StreamingApi) => Promise<void>,
  responseFactory?: (c: Context, stream: StreamingApi) => Response // new!
): Response

same fix can be applied to streamText and streamSSE.

Author should do the followings, if applicable

• Add tests
• Run tests
• bun denoify to generate files for Deno

[Kanahiro]

Or this may be better?

// typeof stream()
(
  c: Context,
  cb: (stream: StreamingApi) => Promise<void>,
  options: {
    onError?: (e: Error, stream: StreamingApi) => Promise<void>,
    responseFactory?: (c: Context, stream: StreamingApi) => Response
  } = {}
): Response