Pi Pico has additional features that could be exposed

[andrewdavidmackenzie]

See https://docs.rs/embassy-rp/latest/embassy_rp/struct.Peripherals.html

Apart from some peripherals common with RPi, such as:

• UARTs
• SPIs
• PWM
• ADC?
• PIO?

The Pico has some additional devices that could be exposed to the UI.

Examples are:

• on-board LED
• BOOTSEL input button
• Temperature sensor
• RTC
• USB
• FLASH
• PIO?
• Watchdog timer