Integrate mcutie library for MQTT functionality

- Added `mcutie` as a dependency in `Cargo.toml` and updated `Cargo.lock`.
- Replaced commented-out MQTT logic with fully implemented functionality in `esp.rs`.
- Enhanced MQTT publish and subscription handling with configurable topics and error handling.
- Updated MQTT connection logic to improve reliability and logging.

Software/MainBoard/rust/Cargo.toml

@@ -109,6 +109,7 @@ unit-enum = "1.4.3"
 async-trait = "0.1.89"
 option-lock = { version = "0.3.1", default-features = false }
 measurements = "0.11.1"
+mcutie = { path = "src/mcutie_3_0_0", features = ["log"] }
 
 #bq34z100 = { path = "../../bq34z100_rust" }