message: refactor(http1): emit trace logs when buffering write data
diff: @@ -512,6 +512,11 @@ where
  let head = self.headers_mut();
  head.maybe_unshift(buf.remaining());
  + trace!(
  + self.len = head.remaining(),
  + buf.len = buf.remaining(),
  + "buffer.flatten"
  + );
  //perf: This is a little faster than <Vec as BufMut>>::put,
  //but accomplishes the same result.
  loop {
  @@ -527,6 +532,11 @@ where
  }
  }
  WriteStrategy::Queue => {
  + trace!(
  + self.len = self.remaining(),
  + buf.len = buf.remaining(),
  + "buffer.queue"
  + );
  self.queue.push(buf.into());
  }
  }
  