Add mcutie MQTT client implementation and improve library structure

- Integrated `mcutie` library as a core MQTT client for device communication.
- Added support for Home Assistant entities (binary sensor, button) via MQTT.
- Implemented buffer management, async operations, and packet encoding/decoding.
- Introduced structured error handling and device registration features.
- Updated `Cargo.toml` with new dependencies and enabled feature flags for `serde` and `log`.
- Enhanced logging macros with configurable options (`defmt` or `log`).
- Organized codebase into modules (buffer, components, IO, publish, etc.) for better maintainability.

fix legacy dependecencies and compatiblity with mcutie vendored lib

fix shit i hate this

rust/src/hal/esp.rs

@@ -831,6 +831,7 @@ impl Esp<'_> {
                         Error::TooLarge => false,
                         Error::PacketError => false,
                         Error::Invalid => false,
+                        Error::Rejected => false,
                     };
                     if !retry {
                         bail!(
@@ -925,9 +926,6 @@ async fn mqtt_incoming_task(
                 MQTT_CONNECTED_EVENT_RECEIVED.store(false, Ordering::Relaxed);
                 info!("Mqtt disconnected");
             }
-            MqttMessage::HomeAssistantOnline => {
-                info!("Home assistant is online");
-            }
         }
     }
 }