Add completions for arduino-cli

[DRSDavidSoft]

The Arduino CLI tool is a utility written in Go language that is used to upload programs to Arduinos and also provides serial monitor functionality. Its functionality is similar to how adb is used for Android.

Can you please provide completions for the commands and switches?

Additionally, if you could please also write completions for avrdude, a small utility that is used by arduino-cli to upload code to AVR microcontrollers, I'd appreciate hugely.

Thank you!

[chrisant996]

@DRSDavidSoft I don't use those tools, so I can't write or test completions for them.

Maybe someone else can write commissions and contribute them.