refactor(node): improve body streaming

[alexfriesen]

This PR improves the streamBody functions performance and closes the stream after it's completed.

This change is strongly inspired by @honojs/node-server approach.

Before:

Node.js:         v22.13.0
OS:              darwin arm64
OHA:             1.6.0


node... 116485 req/sec
srvx... 62466 req/sec
srvx-fast... 101216 req/sec
┌───────────┬──────────────────┐
│ (index)   │ Values           │
├───────────┼──────────────────┤
│ node      │ '116485 req/sec' │
│ srvx-fast │ '101216 req/sec' │
│ srvx      │ '62466 req/sec'  │
└───────────┴──────────────────┘

After:

Node.js:         v22.13.0
OS:              darwin arm64
OHA:             1.6.0


node... 115214 req/sec
srvx... 66832 req/sec
srvx-fast... 101813 req/sec
┌───────────┬──────────────────┐
│ (index)   │ Values           │
├───────────┼──────────────────┤
│ node      │ '115214 req/sec' │
│ srvx-fast │ '101813 req/sec' │
│ srvx      │ '66832 req/sec'  │
└───────────┴──────────────────┘

[pi0]

Thank you for PR ❤️ I did run bench on a few servers, and it seems the difference is not reliable (especially on -fast variant, the simple loop is sometimes faster in order of 10,000 )

However, I like the new impl because the socket is closed and we respect drain events 👍🏼