defmt and/or probe-run support

[usbalbin]

It would be nice to have support for things like defmt and/or probe-run/probe-rs or similar. I imagine defmt would make a lot of sense for fast and efficient logging of lots of datapoints to build graphs. Also things like probe-run to allow communication using debugger instead of serial.

Not sure how or even if this would fit into this project, but as a user, it would be nice :)

Perhaps the easiest and most flexible would be something like adding stdin under "Devices" so the user can pipe the output of any external tool to serial monitor?

me@box:~/my-embedded-project$ cargo run | serial-monitor-rust