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Hacking Bluetooth to brew coffee in GitHub actions

Part 1 of reverse-engineering a Bluetooth coffeemaker: BTLE basics, traffic sniffing, and sending brew commands from Rust. This is my adventure reverse engineering a De'Longhi coffeemaker's Bluetooth-Low-Energy-based protocol, writing a rust CLI for it, and hooking it up to GitHub actions to let us brew from either the browser or the GitHub app by filing issues (all the coffee are defined in issue templates).

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