Add xtask to implement http/mqtt/ota servers locally

[SergioGasquez]

❯ cargo xtask --help
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.06s
     Running `target/debug/xtask --help`
Project automation tasks

Usage: xtask <COMMAND>

Commands:
  mqtt-server  Starts a local MQTT v5 server and prints all received messages
  http-server  Starts a local HTTP server and prints incoming sensor payloads from `POST /sensor`
  ota-server   Starts a local OTA HTTP server and serves `GET /firmware.bin`
  help         Print this message or the help of the given subcommand(s)

Options:
  -h, --help  Print help

[MabezDev]

Can we print the host IP from the xtask server? Just to save the user finding it themselves.

[jessebraham]

LGTM