Rust APIs and abstractions for embedded services

(WiFi, Network, Httpd, Logging, etc.)

The APIs currently have a single implementation for the ESP32[-XX] / ESP-IDF.

However, they are portable and should be possible to implement for other boards too.

For more information, check out: * The Rust on ESP Book * The esp-idf-svc project * The esp-idf-template project * The esp-idf-sys project * The esp-idf-hal project * The Rust for Xtensa toolchain * The Rust-with-STD demo project