bug: fix the latency issue with ping exchange

[lla-dane]

Optimized the read/write path in the whole stack for minimizing ping-exchange latency.

Sequential ping rtt benchmarks in microseconds:

Command => ping /ip4/127.0.0.1/tcp/33475/p2p/9UpEicBWRbjja8DaMfCwv5XHW5XaY3Pk19T1ubibykN6 
WARN Making a connection first: 9UpEicBWRbjja8DaMfCwv5XHW5XaY3Pk19T1ubibykN6
INFO New peer connected: 9UpEicBWRbjja8DaMfCwv5XHW5XaY3Pk19T1ubibykN6
DEBUG Ping rtt exchange: RTT = [319]
DEBUG Ping rtt exchange: RTT = [303]
DEBUG Ping rtt exchange: RTT = [296]
DEBUG Ping rtt exchange: RTT = [254]
DEBUG Ping rtt exchange: RTT = [186]
DEBUG Ping rtt exchange: RTT = [226]
DEBUG Ping rtt exchange: RTT = [258]
DEBUG Ping rtt exchange: RTT = [275]
DEBUG Ping rtt exchange: RTT = [262]
DEBUG Ping rtt exchange: RTT = [226]

with an avg of ~260μs. Still a ~100μs slower a compared to rust-libp2p with an avg rtt of ~160μs

soi@soiarch ~/Desktop/rust-libp2p/examples/ping ❯ cargo run --release -- /ip4/127.0.0.1/tcp/32791
    Finished `release` profile [optimized] target(s) in 0.20s
     Running `/home/soi/Desktop/rust-libp2p/target/release/ping-example /ip4/127.0.0.1/tcp/32791`
Dialed /ip4/127.0.0.1/tcp/32791
Listening on /ip4/127.0.0.1/tcp/43113
Listening on /ip4/172.20.108.39/tcp/43113
Listening on /ip4/172.16.68.81/tcp/43113
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(55.594µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(210.968µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(136.648µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(198.665µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(198.314µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(246.965µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(175.08µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(170.291µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(169.46µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(185.34µs) }
Event { peer: PeerId("12D3KooWQneXF5e57wLnhcSPcYF9peXqMLyk2SjQtGaxk94DjVFi"), connection: ConnectionId(1), result: Ok(143.16µs) }