refactor(lib): Import tracing macros per-module

Instead of one #[macro_use] at the crate root.

src/proto/h1/io.rs

@@ -6,6 +6,7 @@ use std::mem::MaybeUninit;
 
 use bytes::{Buf, BufMut, Bytes, BytesMut};
 use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+use tracing::{debug, trace};
 
 use super::{Http1Transaction, ParseContext, ParsedMessage};
 use crate::common::buf::BufList;