Fix hot-path replay bounds and ME control allocations

Signed-off-by: Alexey <247128645+axkurcom@users.noreply.github.com>

src/transport/middle_proxy/codec.rs

@@ -9,6 +9,7 @@ use crate::protocol::constants::*;
 pub(crate) enum WriterCommand {
     Data(Bytes),
     DataAndFlush(Bytes),
+    ControlAndFlush([u8; 12]),
     Close,
 }
 
@@ -42,6 +43,13 @@ pub(crate) fn rpc_crc(mode: RpcChecksumMode, data: &[u8]) -> u32 {
     }
 }
 
+pub(crate) fn build_control_payload(tag: u32, value: u64) -> [u8; 12] {
+    let mut payload = [0u8; 12];
+    payload[..4].copy_from_slice(&tag.to_le_bytes());
+    payload[4..].copy_from_slice(&value.to_le_bytes());
+    payload
+}
+
 pub(crate) fn build_rpc_frame(seq_no: i32, payload: &[u8], crc_mode: RpcChecksumMode) -> Vec<u8> {
     let total_len = (4 + 4 + payload.len() + 4) as u32;
     let mut frame = Vec::with_capacity(total_len as usize);